The index of refraction for water is about 4/3. What happens as a beam of light travels from air into water?

Question

Accepted Answer

Its speed decreases to 3c/4 , and its wavelength decreases by a factor of 3/4.

Answer

Its speed and frequency remain the same.

Answer

Its speed increases to 4c/3 , and its frequency decreases.

Answer

Its speed decreases to 3c/4 , and its wavelength increases by a factor of 4/3.

Answer

Its speed decreases to 3c/4 , and its frequency increases.

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