Principle of Sunglasses

Principle of Sunglasses

Polarized sunglasses are used to cut glare from sunlight reflected at a glancing angle off cars, water, and other surfaces. Such sunglasses are a practical application of which of the following physical principles?

A) Brewster’s law

B) Lenz’s law

C) Coulomb’s law

D) Snell’s law

Answer: A


According to
Brewster’s law, reflected light will always be polarized in a horizontal direction, parallel to the reflecting surface. Polarized sunglasses are constructed to block this reflected light and to transmit light polarized only in the vertical direction.

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