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$\bullet$ The polarizing angle for light in air incident on a glass plate is $57.6^{\circ} .$ What is the index of refraction of the glass?

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1.5757

Physics 102 Electricity and Magnetism

Physics 103

Chapter 23

Electromagnetic Waves and Propagationof Light

Electromagnetic Waves

Reflection and Refraction of Light

Cornell University

University of Washington

Simon Fraser University

McMaster University

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.

01:26

$\bullet$ The polarizing a…

01:03

The critical angle for a c…

01:09

A beam of light is inciden…

01:54

Light is reflected from a …

00:30

Light traveling in water s…

01:41

01:00

Light in vacuum is inciden…

01:52

A ray of light in air is i…

to answer this question. We're going to use this formal here tangent there p is equal to and b over in a in this problem we know in a is air And so it's 1.0 and in the we don't know, but we know it. It is due to the glass. So I'm gonna replace in, be within glass and then we do know this state. So solving this equation for NB gets N B is equal to a tangent of data. P here are multiplied by in a butt in it is just one. So it might as well just not be here. And so now we can plug in 57.6 here. So this is 57.6 degrees. Playing that in gives in B is evil to 1.58 And that's the answer

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