Light that is traveling in water (with an index of...

Name: Problem 69, Chapter 33: Fundamentals of Physics
Uploaded: 2021-07-07T16:32:30-08:00
Duration: 2 min 19 s
Channel: Sheh Lit Chang
Description: Light that is traveling in water (with an index of refraction of 1.33) is incident on a plate of glass (with index of refraction 1.53). At what angle of incidence does the reflected light end up fully polarized?

Light that is traveling in water (with an index of refraction of 1.33) is incident on a plate of glass (with index of refraction 1.53). At what angle of incidence does the reflected light end up fully polarized?

Key Concepts

Brewster’s Angle

Brewster’s angle is the angle of incidence at which light striking a surface is reflected with complete polarization. At this specific angle, known as Brewster's angle, the reflected light is polarized perpendicular to the plane of incidence. The condition for Brewster's angle is given by the relation tan(?B) = n?/n?, where n? is the refractive index of the initial medium and n? is that of the second medium.

Polarization

Polarization refers to the orientation of the oscillations of the electric field of a light wave. Unpolarized light consists of waves vibrating in various planes, while polarized light has waves that vibrate predominantly in one direction. Polarization is a key concept in understanding light behavior when it interacts with surfaces, such as during reflection and transmission.

Index of Refraction

The index of refraction is a measure of how much a medium slows down light compared to its speed in a vacuum. It is fundamental in describing how light bends as it travels from one medium to another. Variations in the index of refraction between different materials lead to refraction and affect phenomena like reflection, particularly as described by Brewster’s angle.

Snell’s Law

Snell’s law relates the angles of incidence and refraction to the refractive indices of two different media through the equation n? sin(??) = n? sin(??). This law is crucial for predicting the path of light as it passes from one medium into another, and it sets the groundwork for understanding other optical principles such as Brewster’s angle.

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