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$\bullet$ A beam of laser light of wavelength 632.8 nm falls on a thinslit 0.00375 $\mathrm{mm}$ wide. After the light passes through the slit, atwhat angles relative to the original direction of the beam is itcompletely cancelled when viewed far from the slit?

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$\pm 9.71^{\circ}, \pm 19.7^{\circ}, \pm 30.4^{\circ}, \pm 42.4^{\circ}, \pm 57.5^{\circ}$

Physics 102 Electricity and Magnetism

Physics 103

Chapter 26

Interference and Diffraction

Electromagnetic Waves

Reflection and Refraction of Light

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Lectures

02:30

In optics, ray optics is a geometric optics method that uses ray tracing to model the propagation of light through an optical system. As in all geometric optics methods, the ray optics model assumes that light travels in straight lines and that the index of refraction of the optical material remains constant throughout the system.

10:00

In optics, reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves. The law of reflection says that for specular reflection the angle at which the wave is incident on the surface equals the angle at which it is reflected. Reflection may also be referred to as "mirror image" or "specular reflection". Refraction is the change in direction of a wave due to a change in its speed. The refractive index of a material is a measure of its ability to change the direction of a wave. A material with a higher refractive index will change the direction of a wave to a greater degree than a material with a lower refractive index. When a wave crosses the boundary between two materials with different refractive indices, part of the wave is refracted; that is, it changes direction. The ratio of the speeds of propagation of the two waves determines the angle of refraction, which is the angle between the direction of the incident and the refractive rays.

02:59

A beam of laser light of w…

0:00

A beam of blue laser light…

02:41

beam of laser light of wav…

02:52

Light from a He-Ne laser $…

02:02

Laser light with a wavelen…

01:11

01:02

A laser beam $(\lambda=632…

06:33

A photon with wavelength $…

00:56

(II) A parallel beam of li…

02:29

A student holds a laser th…

01:27

A long narrow horizontal s…

Okey dokey. Time for some single slight refraction. Okay, so we have a wavelength of 632.8 nana meters, The wits of our slit. Your look uses as a 0.37 five millimeters. And we want to know at what angles are we going to see our dark fringes on a super faraway screen? All right, so if that's the case, the relationship between the angle and the slits and we've links it's given by scientist A equals and the Lambda over a where m is our EMF slit or French. Excuse me. My land is the wavelength of the light, and a is the width of the slip. All right, so the angle if we take the inverse sine of both sides tube, we in just plug in different values of M and see what comes up. So we'll just plug in. All of our numbers will leave him, as is Lambda. 632.8 Nano. So it's 10 to the minus nine meters over a, which was 0.0 375 Millie who attend to the murders. Three meters. All right, so If I plug in and meagles plus or minus one, I get an angle the plus or minus 9.71 degrees. That's plus or minus, because you can have one on the right side and one on the left side if it's plus, um, or minus him if I play gin and Michel's too RIA. 19.72 degrees, um equals poster minus three. We, uh, plus remoteness 30 point for one degrees for four may get 42 0.45 degrees vehicles five plus or minus 57 0.54 degrees. And if you try to pull you in any higher values of em, you get a syntax error because you are outside the domain of son, which means that's it. That's all we got.

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