JEE Physics

Problem 2211

The velocity of light is maximum in a medium of
(A) diamond
(B) water
(C) glass
(D) vacuum

Mirza Aslam Beig

Numerade Educator

01:59

A light of wavelength $320 \mathrm{~nm}$ enters in a medium of refractive index $1.6$ from the air of refractive index $1.0$. The new wavelength of light in the medium will be $\mathrm{nm}$.
(A) 520
(B) 400
(C) 320
(D) 200

Mirza Aslam Beig

Numerade Educator

02:16

Problem 2213

"Bhautik" runs towards a plane mirror with a speed of $20 \mathrm{~ms}^{-1}$, what is the speed of his image ?
(A) $45 \mathrm{~ms}^{-1}$
(B) $20 \mathrm{~ms}^{-1}$
(C) $15 \mathrm{~ms}^{-1}$
(D) $7.5 \mathrm{~ms}^{-1}$

Mirza Aslam Beig

Numerade Educator

01:42

Problem 2214

A ray of light is incident at an angle $30^{\circ}$ on a mirror, The angle between normal and reflected ray is
(A) $15^{\circ}$
(B) $30^{\circ}$
(C) $45^{\circ}$
(D) $60^{\circ}$

Mirza Aslam Beig

Numerade Educator

Problem 2215

The no. of images formed between two parallel plane mirror are
(A) $\infty$
(B) 0
(C) 180
(D) 360

Mirza Aslam Beig

Numerade Educator

01:27

Problem 2216

To get five images of a single object one should have two plane mirrors at an angle of
(A) $36^{\circ}$
(B) $72^{\circ}$
(C) $80^{\circ}$
(D) $302^{\circ}$

Mirza Aslam Beig

Numerade Educator

01:47

Problem 2217

If a glass rod is immersed in a liquid of the same refractive index, then it will
(A) appear bent
(B) appear longer
(C) disappear
(B) appear shorter

Mirza Aslam Beig

Numerade Educator

Problem 2218

For four different transparent medium $\mathrm{n}_{41} \times \mathrm{n}_{12} \times \mathrm{n}_{21}=$
(A) $\left(1 / \mathrm{n}_{41}\right)$
(B) $\mathrm{n}_{41}$
(C) $\mathrm{n}_{14}$
(D) $\left(1 / \mathrm{n}_{14}\right)$

Mirza Aslam Beig

Numerade Educator

00:49

Problem 2219

A Plane mirror produces a magnification of
(A) 0
(B) $+1$
(C) $-1$
(D) $\infty$

Mirza Aslam Beig

Numerade Educator

02:47

Problem 2220

A ray light passes through four transparent media with refractive indices $n_{1}, n_{2}, n_{3}, n_{4}$ as shown in figure. The surfaces of all media are parallel, if the emergent ray DE is parallel of the incident ray $\mathrm{AB}$ we must have
(A) $\mathrm{n}_{1}=\mathrm{n}_{2}$
(B) $\mathrm{n}_{3}=\mathrm{n}_{4}$
(C) $\mathrm{n}_{1}=\mathrm{n}_{4}$
(D) $\mathrm{n}_{2}=\mathrm{n}_{3}$

Mirza Aslam Beig

Numerade Educator

03:31

Problem 2221

A convex lens forms a real image of an object for it s two different positions on a screen if height of the image in both cases be $16 \mathrm{~cm}$ and $4 \mathrm{~cm}$ then height of the object is $\quad \mathrm{cm}$.
(A) $-4$
(B) 4
(C) $-8$
(D) 8

Mirza Aslam Beig

Numerade Educator

01:39

Problem 2222

In shown figure two parallel rays incident on a mirror they are reflected as parallel rays as shown in the same figure what is the nature of the mirror?
(A) plane mirror
(B) concave
(C) convex
(D) plano-concave

Mirza Aslam Beig

Numerade Educator

00:55

Problem 2223

The power of plane glass is
(A) $\infty$
(B) 0
(C) $\overline{2 \mathrm{D}}$
(D) $4 \mathrm{D}$

Ishu Khandelwal

Numerade Educator

Problem 2224

A convex lens is made up of three different materials as shown in figure, for point object placed on its axis, the no. of images formed are
(A) 4
(b) 2
(C) 3
(D) 1

Mirza Aslam Beig

Numerade Educator

01:45

Problem 2225

Two thin lenses of focal length $\mathrm{f}_{1}$ and $\mathrm{f}_{2}$ are coaxially placed in contact with each other then the power of combination is
(A) $\left[\left(\mathrm{f}_{1}+\mathrm{f}_{2}\right) / 2\right]$
(B) $\sqrt{\left(f_{1} / f_{2}\right)}$
(C) $\left[\left(\mathrm{f}_{1} \mathrm{f}_{2}\right) /\left(\mathrm{f}_{1}+\mathrm{f}_{2}\right)\right]$
(D) $\left[\left(\mathrm{f}_{1}+\mathrm{f}_{2}\right) /\left(\mathrm{f}_{1} \mathrm{f}_{2}\right)\right]$

Mirza Aslam Beig

Numerade Educator

Problem 2226

If thin prism of $5^{\circ}$ gives a deviation of $2^{\circ}$ then the refractive index of material of prism is
(A) $1.4$
(B) $1.5$
(C) $1.6$
(D) $1.0$

Mirza Aslam Beig

Numerade Educator

00:52

Problem 2227

It is difficult to see through the fog because
(A) light is scattered by the droplets in the fog.
(B) fog absorbs light.
(C) refractive index of fog is infinity.
(D) light suffers total internal refection.

Mirza Aslam Beig

Numerade Educator

01:40

Problem 2228

What is the time taken in seconds to cross a glass plate of thickness $6 \mathrm{~mm}$ and $\mu=2.0$ by light ?
(A) $8 \times 10^{-11}$
(B) $4 \times 10^{-11}$
(C) $2 \times 10^{11}$
(D) $16 \times 10^{-11}$

Mirza Aslam Beig

Numerade Educator

Problem 2229

Which of the following diagrams shows correctly the dispersion of white light by a prism ?

Mirza Aslam Beig

Numerade Educator

01:27

Problem 2230

Read the following questions and choose if
(A) both assertion and reason are true and the reason is correct explanation of the assertion.
(B) both assertion and reason are true but reason do not explain the assertion.
(C) Assertion is true but the reason are false.
(D) both assertion and reason are false.
(1) Assertion: Focal length of a lens for red color is smaller than its focal length for violet color Reason : is because $\mu_{\mathrm{r}}>\mu_{\mathrm{v}}$
(A) B
(B) A
(C) $\mathrm{C}$
(D) D

Prem Bijarniya

Numerade Educator

01:40

Problem 2231

In which of the following cases a man will not see image greater than himself.
(A) convex mirror
(B) concave mirror
(C) plane mirror
(D) none of these

Mirza Aslam Beig

Numerade Educator

01:22

Problem 2232

A glass slab $(\mathrm{n}=1.5)$ of thickness $9 \mathrm{~cm}$ is placed over a written paper what is the Shift in the letters?
(A) $6 \mathrm{~cm}$
(B) $3 \mathrm{~cm}$
(C) $2 \mathrm{~cm}$
(D) $0 \mathrm{~cm}$

Mirza Aslam Beig

Numerade Educator

02:26

Problem 2233

A concave mirror of focal length $20 \mathrm{~cm}$ forms an virtual image having twice the linear dimensions of the object, the position of the object will be $\mathrm{cm}$
(A) $7.5$
(B) $-10$
(C) 10
(D) $-7.5$

Mirza Aslam Beig

Numerade Educator

03:21

Problem 2234

In experiment to find focal length of a concave mirror a graph is drawn between the magnitude of $\mathrm{u}$ and $\mathrm{v}$. The graph looks like

Mirza Aslam Beig

Numerade Educator

02:02

Problem 2235

A mark at the bottom of the liquid appears to rise by $0.2 \mathrm{~m}$, If depth of the liquid is $2.0 \mathrm{~m}$ then refractive index of the liquid is
(A) $1.80$
(B) $1.60$
(C) $1.33$
(D) $1.11$

Mirza Aslam Beig

Numerade Educator

01:22

Problem 2236

A Sound wave travels from air to water. The angle of incidence is $\alpha_{1}$ and the angle of reflection is $\alpha_{2}$ If the snell's Law is valid then,
(A) $\alpha_{1} \geq \alpha_{2}$
(B) $\alpha_{1}=\alpha_{2}$
(C) $\alpha_{1}>\alpha_{2}$
(D) $\alpha_{1}<\alpha_{2}$

Mirza Aslam Beig

Numerade Educator

02:03

Problem 2237

$1.6$ is a refractive index of plano-convex lens, then the radius of curvature of the curved surface is $60 \mathrm{~cm}$. The focal length of the lens is $\mathrm{cm}$
(B) $10 \overline{0}$
(A) 50
(C) $-50$
(D) $-100$

Mirza Aslam Beig

Numerade Educator

05:15

Problem 2238

One convex lens and one concave lens placed is contact with each other. If the ratio of their power is $(2 / 3)$ and focal length of the combination is $30 \mathrm{~cm}$, then individual focal lengths are
(A) $15 \mathrm{~cm}$ and $-10 \mathrm{~cm}$
(B) $-15 \mathrm{~cm}$ and $10 \mathrm{~cm}$
(C) $30 \mathrm{~cm}$ and $-20 \mathrm{~cm}$
(D) $-30 \mathrm{~cm}$ and $-30 \mathrm{~cm}$

Mirza Aslam Beig

Numerade Educator

02:24

Problem 2239

A thin prism of $3^{\circ}$, angle made from glass of refractive index $1.5$ is combined with another thin prism made from glass of refractive index $1.3$ to produce dispersion without deviation. What is the angle of second prism.
(A) $3^{\circ}$
(B) $-3^{\circ}$
(C) $-5^{\circ}$
(D) $5^{\circ}$

Mirza Aslam Beig

Numerade Educator

01:46

Problem 2240

If a ray of light is incident on a plane mirror at an angle of $30^{\circ}$ then deviation produced by a plane mirror is
(A) $60^{\circ}$
(B) $90^{\circ}$
(C) $120^{\circ}$
(D) $150^{\circ}$

Mirza Aslam Beig

Numerade Educator

01:16

Problem 2241

The frequency of a light wave in a material is $4 \times 10^{14} \mathrm{~Hz}$ and wavelength is $5000 \AA$. The refractive index of material will be take $\left.\mathrm{c}=3 \times 10^{8} \mathrm{~ms}^{-1}\right)$
(A) $1.5$
(B) $1.7$
(C) $1.33$
(D) None of these

Mirza Aslam Beig

Numerade Educator

02:47

Problem 2242

Mono chromatic light of wavelength $399 \mathrm{~nm}$ is incident from air on a water $(\mathrm{n}=1.33)$ Surface. The wavelength of refracted light is $\mathrm{nm}$
(A) 300
(B) $\overline{600}$
(C) 333
(D) 443

Mirza Aslam Beig

Numerade Educator

02:45

Problem 2243

If the refractive index of a material of an equilateral Prism is $\sqrt{3}$, then angle of minimum deviation will be
(A) $50^{\circ}$
(B) $60^{\circ}$
(C) $39^{\circ}$
(D) $\overline{49^{\circ}}$

Mirza Aslam Beig

Numerade Educator

01:13

Problem 2244

If the critical angle for total internal reflection from a medium to vacuum is $30^{\circ}$ then velocity of light in the medium is $-\mathrm{ms}^{-1}\left(\right.$ take $\left.\mathrm{c}=3.0 \times 10^{8} \mathrm{~ms}^{-1}\right)$
(A) $2.0 \times 10^{8}$
(B) $1.5 \times 10^{8}$
(C) $10^{8}$
(D) $1.5 \times 10^{-8}$

Mirza Aslam Beig

Numerade Educator

01:40

Problem 2245

A ray of light passes from glass $(\mathrm{n}=1.5)$ to medium $(\mathrm{n}=1.60)$ The value of the critical angle of glass is
(A) $\sin ^{-1}(16 / 15)$
(B) $\sin ^{-1} \sqrt{(16 / 15)}$
(C) $\sin ^{-1}(1 / 2)$
(D) $\sin ^{-1}(15 / 16)$

Mirza Aslam Beig

Numerade Educator

01:44

Problem 2246

A double convex lens of focal length $6 \mathrm{~cm}$ is made of glass of refractive index $1.5$, The radius of curvature of one surface is double than that of the other surface. The value of small radius of curvature is
(A) 6
(B) 9
(C) 12
(D) $4.5$

Mirza Aslam Beig

Numerade Educator

02:12

Problem 2247

When a ray of light enters in a transparent medium of refractive index $\eta$, then it is observed that the angle of refraction is half of the angle of incidence. The value of angle of incidence will be
(A) $2 \cos ^{-1}(\eta / 2)$
(B) $\cos ^{-1}(\eta / 2)$
(C) $2 \sin ^{-1}(\eta / 2)$
(D) $\sin ^{-1}(\eta / 2)$

Mirza Aslam Beig

Numerade Educator

02:13

Problem 2248

A prism of glass is shown in figure $\mathrm{A}$, ray incident normally on one face is totally reflected. If $\theta$ is $45^{\circ}$, the index of refraction of glass is
(A) $<\sqrt{2}$
(B) $>\sqrt{2} \quad(\mathrm{C})=2$
(D) None of these

Mirza Aslam Beig

Numerade Educator

01:25

Problem 2249

A convex lens made up of a material of refractive index $\mathrm{n}_{1}$ is immersed in a medium of refractive index $\mathrm{n}_{2}$ as shown in the figure. The relation between $\mathrm{n}_{1}$ and $\mathrm{n}_{2}$ is
(A) $\mathrm{n}_{1}=\sqrt{\mathrm{n}_{2}}$
(B) $\mathrm{n}_{1}=\mathrm{n}_{2}$
(C) $\mathrm{n}_{1}<\mathrm{n}_{2}$
(D) $\mathrm{n}_{1}>\mathrm{n}_{2}$

Mirza Aslam Beig

Numerade Educator

02:36

Problem 2250

Two plano-convex lenses of radius of curvature $R$ and refractive index $\mathrm{n}=1.5$ will have equivalent focal length equal to $\mathrm{R}$, when they are placed
(A) at distance $\mathrm{R}$
(B) at distance $(\mathrm{R} / 2)$
(C) at distance $(\mathrm{R} / 4)$
(D) in contact with each other

Mirza Aslam Beig

Numerade Educator

02:22

Problem 2251

A double convex lens made of glass of refractive index $1.6$ has radius of curvature $15 \mathrm{~cm}$ each. The focal length of this lens when immersed in a fluid of refractive index $1.63$ is
(A) $-40.75$
(B) $-407.5$
(C) $-125$
(D) $12.5$

Mirza Aslam Beig

Numerade Educator

01:53

Problem 2252

One ray of light suffers minimum deviation in an equilateral prism P additional prism $\mathrm{Q}$ and $\mathrm{R}$ of identical shape and made up of same material shown in figure. The ray will now suffer
(A) greater deviation
(B) same deviation as before
(C) total internal reflection
(D) no deviation

Mirza Aslam Beig

Numerade Educator

03:04

Problem 2253

Which of the following colors is scattered minimum?
(A) Violet
(B) red
(C) blue
(D) yellow

Mirza Aslam Beig

Numerade Educator

02:29

Problem 2254

Angle of minimum deviation for a prism refractive index $1.5$ is equal to the angle of the prism. Then the angle of prism (given, $\sin 48^{\circ} 36^{\prime}=0.75$ )
(A) $62^{\circ}$
(B) $82^{\circ}$
(C) $60^{\circ}$
(D) $41^{\circ}$

Mirza Aslam Beig

Numerade Educator

01:48

Problem 2255

In a thin prism of glass $\left(a_{(n) g}=1.5\right)$ which of the following relation between the angle of minimum deviation $\delta_{\mathrm{m}}$ and the angle of refraction $\mathrm{r}$ will be correct?
(A) $\delta_{\mathrm{m}}=(\mathrm{r} / 2)$
(B) $\left(\delta_{\mathrm{m}} / 2\right)=\mathrm{r}$
(C) $\delta_{\mathrm{m}}=1.5 \mathrm{r}$
(D) $\delta_{\mathrm{m}}=\mathrm{r}$

Mirza Aslam Beig

Numerade Educator

02:17

Problem 2256

An observer look at a tree of height 10 meters away with a telescope of magnifying power $10 .$ To him, the tree appears
(A) 10 times taller
(B) 10 times smaller
(C) 10 times nearer
(D) 20 times nearer

Mirza Aslam Beig

Numerade Educator

02:41

Problem 2257

A normal person wants to see two pillars at a distant $11 \mathrm{~km}$ away separately. The distance between two pillars should be approximately
(A) $1 \mathrm{~m}$
(B) $3.2 \mathrm{~m}$
(C) $0.5 \mathrm{~m}$
(D) $1.6 \mathrm{~m}$

Mirza Aslam Beig

Numerade Educator

Problem 2258

When the length of microscope tube increases, its magnifying power
(A) decreases
(B) increase
(C) does not change
(D) none of these

Mirza Aslam Beig

Numerade Educator

01:36

Problem 2259

The focal lengths of objective and the eye-piece of a compound microscope are $F_{0}$ and $F_{e}$ respectively. Then
(A) $\mathrm{F}_{0}>\mathrm{F}_{\mathrm{e}}$
(B) $\mathrm{F}_{0}<\mathrm{F}_{\mathrm{e}}$
(C) $\mathrm{F}_{0}=\mathrm{F}_{\mathrm{e}}$
(D) none of these

Mirza Aslam Beig

Numerade Educator

02:22

Problem 2260

The magnifying power of a telescope is 9, when it is focused for parallel rays, then the distance between its objective and eye-piece is $20 \mathrm{~cm}$ The focal lengths of lenses will be
(A) $15 \mathrm{~cm}, 5 \mathrm{~cm}$
(B) $18 \mathrm{~cm}, 2 \mathrm{~cm}$
(C) $10 \mathrm{~cm}, 5 \mathrm{~cm}$
(D) $11 \mathrm{~cm}, 9 \mathrm{~cm}$

Mirza Aslam Beig

Numerade Educator

Problem 2261

A plano convex lens off $=20 \mathrm{~cm}$ is silvered at plane surface New f will be $\quad \mathrm{cm}$
(A) 20
(B) 40
(C) 30
(D) 60

Mirza Aslam Beig

Numerade Educator

03:14

Problem 2262

A ray of light from denser medium strikes a rarer medium at angle of incidence i. The reflected and refracted rays make an angle of $90^{\circ}$ with each other. The angle of reflection and refraction are r and $\mathrm{r}^{\prime}$ respectively. The critical angle is
(A) $\sin ^{-1}(\tan i)$
(B) $\tan ^{-1}(\tan \mathrm{r})$
(C) $\tan ^{-1}(\sin i)$
(D) $\sin ^{-1}(\tan \mathrm{r})$

Mirza Aslam Beig

Numerade Educator

02:19

Problem 2263

Relation between critical angle of water $C_{w}$ and that of the glass $\mathrm{C}_{\mathrm{g}}$ is (given, $\left.\mathrm{n}_{\mathrm{w}}=(4 / 3), \mathrm{n}_{\mathrm{g}}=1.5\right)$
(A) $\mathrm{C}_{\mathrm{w}}<\mathrm{C}_{\mathrm{g}}$
(B) $\mathrm{C}_{\mathrm{w}}=\mathrm{C}_{\mathrm{g}}$
(C) $\mathrm{C}_{\mathrm{w}}>\mathrm{C}_{\mathrm{g}}$
(D) $\mathrm{C}_{\mathrm{w}}=\mathrm{C}_{\mathrm{g}}=\mathrm{O}$

Mirza Aslam Beig

Numerade Educator

01:32

Problem 2264

The radius of curvature of convex surface of a thin plano-convex lens is $15 \mathrm{~cm}$ and refractive index of its material is $1.6 .$ The power of the lens will be
(A) $6 \mathrm{D}$
(B) $5 \mathrm{D}$
(C) $4 \mathrm{D}$
(D) $3 \mathrm{D}$

Mirza Aslam Beig

Numerade Educator

01:59

Problem 2265

A ray of light passes through a prism having refractive index $(\mathrm{n}=\sqrt{2})$, Suffers minimum deviation If angle of incident is double the angle of refraction within prism then angle of prism is
(A) $30^{\circ}$
(B) $60^{\circ}$
(C) $90^{\circ}$
(D) $180^{\circ}$

Mirza Aslam Beig

Numerade Educator

01:25

Problem 2266

An air bubble inside glass slab $(\mathrm{n}=1.5)$ appear from one side at $6 \mathrm{~cm}$ and from other side at $4 \mathrm{~cm}$. Then the thickness of glass slab is $\mathrm{cm}$
(A) 5
(B) 10
(C) 15
(D) 20

Mirza Aslam Beig

Numerade Educator

01:15

Problem 2267

The magnifying power of objective of a compound microscope is $5.0$ If the magnifying power of microscope is 30 , then magnifying power of eye-piece will be
(A) 3
(B) 6
(C) 9
(D) 12

Mirza Aslam Beig

Numerade Educator

Problem 2268

Light of certain color contain 2000 waves in the length of $1 \mathrm{~mm}$ in air. What will be the wavelength of this light in medium of refractive index $1.25$ ?
(A) $1000 \AA$
(B) $2000 \AA$
(C) $3000 \AA$
(D) $4000 \AA$

Mirza Aslam Beig

Numerade Educator

Problem 2269

In each of the following questions match column-I and column-II and select the correct match out of the four given choices.
(A) $i-a, i i-b$, ii $-c$, iv-d
(B) $\mathrm{i}-\mathrm{d}, \mathrm{ii}-\mathrm{c}, \mathrm{ii}-\mathrm{b}, \mathrm{iv}-\mathrm{a}$
(C) $\mathrm{i}-\mathrm{b}, \mathrm{ii}-\mathrm{c}, \mathrm{iii}-\mathrm{d}, \mathrm{iv}-\mathrm{a}$
(D) $i-c$, ii $-b$, iii $-d$, iv-a

Prem Bijarniya

Numerade Educator

Problem 2270

$$
\begin{array}{|l|l|}
\hline \text { Column - I } & \text { Column - II } \\
\hline \text { (i) While going from rarer to denser medium } & \text { (a) Wavelength changes } \\
\text { (ii) While going from denser to rarer medium } & \text { (b) } \eta=(\mathrm{C} / \mathrm{V}) \\
\text { (iii) While going to one medium to another } & \text { (C) Ray bends towards normal } \\
\text { (iv) Refractive index of medium } & \text { (D) Rav bends awav from normal } \\
\hline
\end{array}
$$
(A) $i-c$, ii $-d$, iii $-b$, iv-a
(B) $\mathrm{i}-\mathrm{a}$, ii $-\mathrm{b}$, iii $-\mathrm{c}, \mathrm{iv}-\mathrm{d}$
(C) $\mathrm{i}-\mathrm{c}, \mathrm{ii}-\mathrm{b}, \mathrm{iii}-\mathrm{a}, \mathrm{iv}-\mathrm{d}$
(D) $i-d, 1 i-c, 11 i-b, i v-a$

Prem Bijarniya

Numerade Educator

02:01

Problem 2271

$$
\begin{array}{|l|l|}
\hline \text { Column - I } & \text { Column - II } \\
\hline \text { (i) Minimum deviation } & \text { (a) }(\mathrm{n}-1) \mathrm{A}+\left(\mathrm{n}^{\prime}-1\right) \mathrm{A}^{\prime}=0 \\
\text { (ii) Angular dispersion } & \text { (b) }\left[\left(\mathrm{n}_{\mathrm{v}}-\mathrm{n}_{\mathrm{r}}\right) /(\mathrm{n}-1)\right] \\
\text { (iii) Dispersive power } & \text { (c) }\left(\mathrm{n}_{\mathrm{v}}-\mathrm{n}_{\mathrm{r}}\right) \mathrm{A} \\
\text { (iv) Condition for no deviation } & \text { (d) }(\mathrm{n}-1) \mathrm{A} \\
\hline
\end{array}
$$
(A) $i-c$, ii $-d$, ii $-b$, iv-a
(B) $i-a, 1 i-b$, iii $-c$, iv-d
(C) $i-c$, ii $-b$, ii $-a$, iv-d
(D) $\mathrm{i}-\mathrm{d}, \mathrm{i} i-\mathrm{c}, \mathrm{ii}-\mathrm{b}, \mathrm{iv}-\mathrm{a}$

Prem Bijarniya

Numerade Educator

03:52

Problem 2272

A convex lens of glass $(\mathrm{n}=1.5)$ has focal length $0.2 \mathrm{~m}$. The lens is immersed in water of refractive index $1.33$. The change in the power of convex lens is
(A) $3.72 \mathrm{D}$
(B) $4.62 \mathrm{D}$
(C) $6.44 \mathrm{D}$
(D) $1.86 \mathrm{D}$

Mirza Aslam Beig

Numerade Educator

Problem 2273

For a prism of refractive index $\sqrt{3}$, the angle of minimum deviation is equitation is equal to the angle of prism, then angle of the prism is
(A) $60^{\circ}$
(B) $90^{\circ}$
(C) $45^{\circ}$
(D) $180^{\circ}$

Mirza Aslam Beig

Numerade Educator

Problem 2274

A ray of light is incident normally on one of the faces of a solid prism of apex angle $30^{\circ}$ and refractive index $\sqrt{2}$. The angle of minimum deviation is
(A) $39^{\circ}$
(B) $42^{\circ}$

Mirza Aslam Beig

Numerade Educator

04:12

Problem 2275

A plano-convex lens has been fixed exactly into a plano-concave lens as shown in figure. Their plane surface are parallel to each other. If both the lenses are made of different materials of refractive indices $\mathrm{n}_{1}$ and $\mathrm{n}_{2}, \mathrm{R}$ is the radius of curvature of the curved surface of the lens, their focal length of the combination will be
(A) $\left[\mathrm{R} /\left\{2\left(\mathrm{n}_{1}+\mathrm{n}_{2}\right)\right\}\right]$
(B) $\left.\overline{\left[\mathrm{R} /\left(\mathrm{n}_{1}-\mathrm{n}_{2}\right)\right.}\right]$
(C) $\left[\mathrm{R} /\left(\mathrm{n}_{1}+\mathrm{n}_{2}\right)\right]$
(D) $\left[\mathrm{R} /\left\{2\left(\mathrm{n}_{1}-\mathrm{n}_{2}\right)\right\}\right]$

Mirza Aslam Beig

Numerade Educator

03:48

Problem 2276

A concave mirror has a focal length $30 \mathrm{~cm}$. The distance between the two position of the object for which image size is double of the object is
(A) $30 \mathrm{~cm}$
(B) $15 \mathrm{~cm} \quad \overline{\text { (C) }-25 \mathrm{~cm}}$
(D) $-15 \mathrm{~cm}$

Mirza Aslam Beig

Numerade Educator

04:18

Problem 2277

A concave lens forms the image of an object such that the distance between the object and the image is $10 \mathrm{~cm}$ and the magnification produced is $(1 / 4)$, the focal length of lens will be $\mathrm{cm}$
(A) - 6.2
(B) $-12.4$
(C) $-4.4$
(D) $-8.8$

Mirza Aslam Beig

Numerade Educator

Problem 2278

A prism of certain angle deviates the red and blue rays by $8^{\circ}$ and $12^{\circ}$ respectively. Another prism of the same prism angle deviates the red and blue ray by $10^{\circ}$ and $14^{\circ}$ respectively. The prism are small angle and made of different materials. The dispersive powers of the materials of the prisms are in the ratio
(A) $5: 6$
(B) $9: 11$
(C) $6: 5$
(D) $11: 9$

Prem Bijarniya

Numerade Educator

Problem 2279

The head light of a jeep are $1.2 \mathrm{~m}$ apart. If the pupil of the eye of an observer has a diameter of $2 \mathrm{~mm}$ and light of wavelength $5896 \AA$ is used what should be the maximum distance of the jeep from the observer if two head lights are just seem to be separated apart?
(A) $30.9 \mathrm{~km}$
(B) $33.4 \mathrm{~km}$
(C) $3.34 \mathrm{~km}$
(D) $30.9 \mathrm{~km}$

Mirza Aslam Beig

Numerade Educator

03:52

Problem 2280

Two plano-convex lens each of focal length $10 \mathrm{~cm}$ and refractive index $(3 / 2)$ are placed as shown. Water [R. I. $=(4 / 3)]$ is filled between. The whole arrangement is air. The optical power of the system is (in diopters)
(A) $-6.67$
(B) $33.3$
(C) 20
(D) $6.67$

Mirza Aslam Beig

Numerade Educator

01:37

Problem 2281

Interference is possible in
(A) light waves only
(B) sound waves only
(C) both light and Sound waves
(D) none of these

Mirza Aslam Beig

Numerade Educator

00:51

Problem 2282

Huygens wave theory of light can not explain phenomena.
(A) Diffraction
(B) Interference
(C) Polarization
(D) Photoelectric effect

Mirza Aslam Beig

Numerade Educator

01:06

Problem 2283

The correct curve between fringe width $\beta$ and distance between the slits $d$ is shown below figure is

Mirza Aslam Beig

Numerade Educator

01:00

Problem 2284

The fringe width for red $\beta_{\mathrm{r}}\left(\lambda_{\mathrm{T}}=8000 \AA\right.$ ) and the fringe width for violet $\beta_{\mathrm{v}}\left(\lambda_{\mathrm{v}}=4000 \AA\right.$ ) then $\left(\beta_{\mathrm{r}} / \beta_{\mathrm{v}}\right)=$
(A) $2: 1$
(B) $1: 2$
(C) $1: 1$
(D) $\sqrt{2}: 1$

Mirza Aslam Beig

Numerade Educator

01:11

Problem 2285

Wave light travels from an optically rarer medium to an optically denser medium its velocity decrease because of change in
(A) frequency
(B) wavelength
(C) amplitude
(D) phase

Mirza Aslam Beig

Numerade Educator

00:54

Problem 2286

In young's double slit experiment if the width of $3^{\text {rd }}$ fringe is $10^{-2} \mathrm{~cm}$, then the width of $5^{\text {th }}$ fringe will be $\mathrm{cm} .$
(A) $10^{-2}$
(B) $5 \times 10^{-2}$
(C) $2 \times 10^{-2}$
(D) $10^{+2}$

Mirza Aslam Beig

Numerade Educator

01:32

Problem 2287

The young's double slit experiment is performed with blue and with green light of wavelengths $4360 \AA$ and $5460 \AA$ respectively. If $\mathrm{x}$ is the distance of $4^{\text {th }}$ maxima from the central one, then
(A) $\mathrm{X}_{\text {blue }}=\mathrm{X}_{\text {green }}$
(B) $\mathrm{X}_{\text {blue }}>\mathrm{X}_{\text {green }}$
(C) $\mathrm{X}_{\text {blue }}<\mathrm{X}_{\text {green }}$
(D) none of these

Mirza Aslam Beig

Numerade Educator

01:43

Problem 2288

The light waves from two coherent sources of same intensity interfere each other. Then what will be maxima intensity when minimum intensity is zero ?
(A) $4 \mathrm{I}$
(B) I
(C) $4 \mathrm{I}^{2}$
(D) $\mathrm{I}^{2}$

Mirza Aslam Beig

Numerade Educator

00:58

Problem 2289

In young's double Slit experiment the seventh maxima with wavelength $\lambda_{1}$, is at a distance $\mathrm{d}_{1}$ and the same maxima with wavelength $\lambda_{2}$, is at a distance $\mathrm{d}_{2}$ Then $\left(\mathrm{d}_{1} / \mathrm{d}_{2}\right)=$
(A) $\left(\lambda_{2} / \lambda_{1}\right)$
(B) $\left(\lambda_{1}^{2} / \lambda_{2}^{2}\right)$
(C) $\left(\lambda_{2}^{2} / \lambda_{1}^{2}\right)$
(D) $\left(\lambda_{1} / \lambda_{2}\right)$

Prem Bijarniya

Numerade Educator

00:52

Problem 2290

The wave length corresponding to photon is $0.016 \AA$. Its K.E. $\quad$ J. $\left(\mathrm{h}=6.66 \times 10^{-34} \mathrm{SI}, \mathrm{c}=3.0 \times 10^{8} \mathrm{~ms}^{-1}\right)$
(A) $1.237 \times 10^{-13}$
(B) $1.237 \times 10^{13}$
(C) $12.37 \times 10^{-13}$
(D) $12.37 \times 10^{+13}$

Mirza Aslam Beig

Numerade Educator

00:44

Problem 2291

In young's double slit experiment, phase difference between light waves reaching 3rd bright fringe from central fringe with, is $(\lambda=5000 \AA)$
(A) zero
(B) $2 \pi$
(C) $4 \pi$
(D) $6 \pi$

Mirza Aslam Beig

Numerade Educator

01:27

Problem 2292

$\mathrm{n}^{\text {th }}$ bright fringe of red light $\left(\lambda_{1}=7500 \AA\right.$ ) Coincides with $(\mathrm{n}+1)^{\text {th }}$ bright fringe of green light $\left(\lambda_{2}=6000 \AA\right)$. The value of $n=$
(A) 8
(B) 4
(C) 2
(D) 1

Mirza Aslam Beig

Numerade Educator

00:57

Problem 2293

Which of the following will undergo maximum diffraction ?
(A) $\alpha-$ particle
(B) $\gamma$ -rays
(C) radio waves
(D) light waves

Mirza Aslam Beig

Numerade Educator

01:19

Problem 2294

A Slit of width $12 \times 10^{-7} \mathrm{~m}$ is illuminated by light of wavelength $6000 \AA$. The angular width of the central maxima is approximately
(A) $30^{\circ}$
(B) $60^{\circ}$
(C) $90^{\circ}$
(D) $0^{\circ}$

Mirza Aslam Beig

Numerade Educator

02:46

Problem 2295

The distance between the first and sixth minima in the diffraction pattern of a single slit, it is $0.5 \mathrm{~mm}$. The screen is $0.5 \mathrm{~m}$ away from the Slit. If the wavelength of light is $5000 \AA$, then the width of the slit will be $\mathrm{mm}$
(D) $1.0$
(A) 5
(B) $2.5$
(C) $1.25$

Mirza Aslam Beig

Numerade Educator

00:33

Problem 2296

change in the polarization phenomena of light.
(A) intensity
(B) wavelength
(C) phase
(D) frequency

Mirza Aslam Beig

Numerade Educator

Problem 2297

In young's double slit experiment the phase difference is constant between two sources is $(\pi / 2)$. The intensity at a point equidistant from the slits in terms of max. intensity $\mathrm{I}_{0}$ is
(A) $3 \mathrm{I}_{0}$
(B) $\left(\mathrm{I}_{0} / 2\right)$
(C) I_{0 }
(D) $\left(3 \mathrm{I}_{0} / 4\right)$

Mirza Aslam Beig

Numerade Educator

Problem 2298

In figure young's double slit experiment $\mathrm{Q}$ is the position of the first bright fringes on the right side of $\mathrm{O}, \mathrm{p}$ is the $11^{\text {th }}$ fringe on the other side as measured from $Q$ If $\lambda=6000 \AA$ then $\mathrm{S}_{1} \mathrm{~B}$ will be $\mathrm{m}$
(A) $6.6 \times 10^{-6}$
(B) $3.3 \times 10^{-6}$
(C) $6 \times 10^{-6}$
(D) $6 \times 10^{+6}$

Prem Bijarniya

Numerade Educator

03:11

Problem 2299

The two coherent sources of intensity ratio $\beta$ produce interference. The fringe visibility will be
(A) $2 \beta$
(B) $(\beta / 2)$
(C) $\{\sqrt{\beta} /(1+\beta)\}$
(D) $\{(2 \sqrt{\beta}) /(1+\beta)\}$

Mirza Aslam Beig

Numerade Educator

00:56

Problem 2300

Light of wave-length $\lambda$ is incident on a slit of width $\mathrm{d}$. The resulting diffraction pattern is observed on a screen placed at a distance $\mathrm{D}$. The linear width of the principal maximum is equal to the width of the slit, then $\mathrm{D}=$
(A) $\left(\mathrm{d}^{2} / 2 \lambda\right)$
(B) $\left(2 \lambda^{2} / \mathrm{d}\right)$
(C) $(\mathrm{d} / \lambda)$
(D) $(2 \lambda / \mathrm{d})$

Mirza Aslam Beig

Numerade Educator

00:46

Problem 2301

A polariser is used for
(A) produce polarised light
(B) produce unpolarised light
(C) produce unpolarised light
(D) none of these

Mirza Aslam Beig

Numerade Educator

01:34

Problem 2302

Read the paragraph and chose the correct answer of the following questions In young experiment position of bright fringes is given by $\mathrm{x}=\mathrm{n} \lambda(\mathrm{D} / \mathrm{d})$ and the position of dark fringes is given by $\mathrm{x}=(2 \mathrm{n}-1)(N 2)(\mathrm{D} / \mathrm{d})$ where $\mathrm{n}=1,2,3 \ldots \ldots \ldots \ldots$ for first
second, third bright/dark fringe. The center of the fringe pattern is bright (for $\mathrm{n}=0$ ). The width of each bright/dark fringe is $\beta=(\lambda \mathrm{D} / \mathrm{d})$, Where $\lambda=5000 \AA$. Slits are $0.2 \mathrm{~cm}$
apart and $\mathrm{D}=1 \mathrm{~m}$
(i) If light of wavelength $6000 \AA$ be used in the above experiment the fringe width would be $\mathrm{mm}$
(A) $0.30$
(B) 3
(C) $0.6$
(D) 6
(ii) with the light of wavelength $5000 \AA$, If experiment were carried out under water of a $n=(4 / 3)$ the fringe width would be
(A) zero
(B) $(4 / 3)$ times
(C) (3/4) times
(D) none of these

Mirza Aslam Beig

Numerade Educator

01:34

Problem 2303

The width of a single slit, if the first minimum is observed at an angle of $2^{\circ}$ with a wavelength of light $6980 \AA$ is $\mathrm{mm}$
(A) $0.2$
(B) $2 \times 10^{-5}$
(C) $2 \times 10^{5}$
(D) $0.02$

Mirza Aslam Beig

Numerade Educator

02:50

Problem 2304

In a fraunhofer diffraction by single slit of width d with incident light of wavelength $5500 \AA$ the first minimum is observed at angle of $30^{\circ}$. The first secondary maximum is observed at an angle $\theta=$
(A) $\sin ^{-1}(1 / \sqrt{2})$
(B) $\sin ^{-1}(3 / 4)$
(C) $\sin ^{-1}(\sqrt{3} / 2)$
(D) $\sin ^{-1}(1 / 4)$

Mirza Aslam Beig

Numerade Educator

00:51

Problem 2305

The phenomenon of polarization of electromagnetic waves proves that the electromagnetic waves are
(A) mechanical
(B) longitudinal
(C) transverse
(D) none of these

Mirza Aslam Beig

Numerade Educator

02:29

Problem 2306

Light from two coherent Sources of the same amplitude $\mathrm{A}$ and wavelength $\lambda$, illuminates the Screen. The intensity of the central maximum is Io. If the sources were incoherent, the intensity at the same point will be
(A) $\left(\mathrm{I}_{0} / 2\right)$
(B) $\left(\mathrm{I}_{0} / 4\right)$
(C) $4 \mathrm{I}_{0}$ (D) $2 \mathrm{I}_{0}$

Mirza Aslam Beig

Numerade Educator

01:35

Problem 2307

When the angle of incidence is $60^{\circ}$ on the Surface of a glass slab, it is found that the reflected ray is completely polarized. Then the velocity of light in glass is $-\mathrm{ms}^{-1}$
(A) $\sqrt{2}$
(B) $\sqrt{3} \times 10^{8}$
(C) $\sqrt{3}$
(D) $\sqrt{2} \times 10^{8}$

Mirza Aslam Beig

Numerade Educator

01:55

Problem 2308

Two beams of Light of intensity $\mathrm{I}_{1}$ and $\mathrm{I}_{2}$ interfere to give an interference pattern. If the ratio of maximum intensity to that of minimum intensity is $(16 / 4)$ then $\left(\mathrm{I}_{1} / \mathrm{I}_{2}\right)=$
(A) $1: 9$
(B) $1: 4$
(C) $4: 1$
(D) $9: 1$

Mirza Aslam Beig

Numerade Educator

01:12

Problem 2309

Which of the following phenomenon is used in optical fibers?
(A) Reflection
(B) Scattering
(C) Total internal refraction
(D) Interference

Mirza Aslam Beig

Numerade Educator

02:07

Problem 2310

Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. (The phase difference between beam is $(\pi / 2)$ at the point $\mathrm{A}$ and $\pi$ at point $\mathrm{B}$.)
(A) I
(B) $4 \mathrm{I}$
(C) $2 \mathrm{I}$
(D) $6 \mathrm{I}$

Mirza Aslam Beig

Numerade Educator