(a) Sunlight reflected from the still surface of a lake is...

Name: Problem 32, Chapter 23: Physics
Uploaded: 2020-06-22T14:42:40-08:00
Duration: 2 min 13 s
Channel: Samantha Baker
Description: (a) Sunlight reflected from the still surface of a lake is totally polarized when the incident light is at what angle with respect to the horizontal? (b) In what direction is the reflected light polarized? (c) Is any light incident at this angle transmitted into the water? If so, at what angle below the horizontal does the transmitted light travel?

(a) Sunlight reflected from the still surface of a lake is totally polarized when the incident light is at what angle with respect to the horizontal? (b) In what direction is the reflected light polarized? (c) Is any light incident at this angle transmitted into the water? If so, at what angle below the horizontal does the transmitted light travel?

Key Concepts

Brewster's Angle

Brewster's angle is the specific angle of incidence at which light with a particular polarization is perfectly transmitted through a surface with no reflection of that polarization component. At this angle, the reflected light is completely linearly polarized. In the context of light reflecting off a water surface, when light striking the surface at Brewster's angle (typically measured relative to the normal, but often converted to an angle with respect to the horizontal) yields reflected light that is entirely polarized.

Polarization by Reflection

Polarization by reflection refers to the phenomenon by which unpolarized light becomes polarized upon reflection from a surface. At Brewster's angle, the reflected beam is linearly polarized in a direction perpendicular to the plane of incidence. This means that the electric field oscillates parallel to the surface, which is crucial in applications like glare reduction and optical filtering.

Snell's Law

Snell's law relates the angles of incidence and refraction to the indices of refraction of two media. It is used to determine the angle at which transmitted light propagates into a second medium (such as water). Even when a beam is incident at Brewster’s angle and the reflected light is fully polarized, part of the light is transmitted into the medium and its path is determined by Snell's law, which indicates how the light bends when entering a medium of different optical density.

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