What happens to a light wave when it is reflected off the surface of a material with a LOWER index of refraction?

The angle of incidence of a light beam onto a reflecting surface is continuously variable. The reflected ray in air is completely polarized when the angle of incidence is 49.8°. What is the index of refraction of the reflecting material? Need Help? Read It Watch It

The index of refraction for water is about 4/3. What happens to light when it travels from air to water? Its speed decreases to 3c/4, and its wavelength decreases by a factor of 3/4 Its speed decreases to 3c/4 and its wavelength increases by a factor of 4/3. Its speed increases to 4c/3, and its frequency decreases by a factor of 3/4. Its speed decreases to 3c/4, and its frequency increases b 4/3.

2. (a) A ray of light in air is incident on an air-to-glass boundary at an angle of exactly 30° with the normal. If the index of refraction of the glass is 1.65, what is the angle of the refracted ray within the glass with respect to the normal?