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Satyam Jha

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Some of the most profound statements on the nature of science have come from Albert Einstein, one of the greatest scientists of all time. What do you think did Einstein mean when he said : "The most incomprehensible thing about the world is that it is comprehensible"?

Some of the most profound statements on the nature of science have come from Albert Einstein, one of the greatest scientists of all time. What do you think did Einstein mean when he said : "The most incomprehensible thing about the world is that it is comprehensible"?

NCERT Class 11 Part 1 - Physics

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Anand Jangid verified

Numerade educator

40. The ratio of amount of Scattering of two light waves A and B is 1:16, then the ratio of the wavelengths of B and A is (1) 16:1 (2) 1:4 (3) 1:2 (4) 6:1

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Anand Jangid verified

Numerade educator

A radius of curvature of plano-convex lens is 15 cm. If speed of light in the material of lens is 2 × 10^8 m/s then the power of lens is (1) 4.3 D (2) 1.3 D (3) 1.5 D (4) 3.3 D

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Anand Jangid verified

Numerade educator

37. A light coming from a medium 1 to medium 2 at an angle of incidence 53° passes along the interface surface of the two media. If speed of light in medium 1 is 2 × 10? m/s then the speed of light in medium 2 is (1) 1.3 × 10? m/s (2) 3.3 × 10? m/s (3) 0.5 × 10? m/s (4) 2.5 × 10? m/s

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Anand Jangid verified

Numerade educator

36. A light is incident on a transparent slab of refractive index n at an angle of 45°. If the angle between the reflected and refracted ray is 105° then the value of n is nearly (1) 1.414 (2) 1.732 (3) 2.82 (4) 1.33

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Anand Jangid verified

Numerade educator

A plano-convex lens fits exactly into a Plano Concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive Indices n and 3n/2 and R is the radius of curvature of the curved surface of the lenses, then the magnitude of power of the combination will be (1) 10 n/R (2) n/2R (3) n/4R (4) 5n/R

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Anand Jangid verified

Numerade educator

34. A tank of depth d is half filled with a liquid of refractive index n and the other half is filled with another liquid of refractive index n/2. The apparent depth of the tank when viewed from above will be (1) dn/6 (2) dn/3 (3) 6d/n (4) 3d/2n

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Anand Jangid verified

Numerade educator

33. The image of a small object fixed on the wall of a room is to be obtained on the opposite wall 2 m away by means of an equiconvex lens refractive index 1.5. The maximum possible radius of curvature of lens will be [NCERT Pg. 236] (1) 0.15 m (2) 0.75 m (3) 0.25 m (4) 0.5 m

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Anand Jangid verified

Numerade educator

32. A concave mirror has a radius of curvature 15 cm. The image of a object is three times the size of the object. The distance of the object from the mirror is (1) 10 cm (2) 15 cm (3) 20 cm (4) 8 cm

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Anand Jangid verified

Numerade educator

Two lenses, first convex of focal length 10 cm and second concave of focal length 10 cm are separated by 5 cm in air. An object is placed at 30 cm from the convex lens, the position and nature of final image by refraction is (1) 20 cm to right of concave lens and virtual (2) 30 cm to left of concave lens and virtual (3) At infinity to right of concave lens and is real (4) At 60 cm to right of concave lens and real

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Anand Jangid verified

Numerade educator

23. An optical fibre made of glass with refractive index ( n_{1}=1.50 ), which is surrounded by another glass of refractive index ( n_{2} ). What is refractive index of cladding such that critical angle between core and cladding is ( 74^{circ} ) [NCERT Pg. 232] (1) 1.62 (2) 1.35 (3) 1.44 (4) 1.20

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