The index of refraction for water is about 4/3. what happens to light when it travels from air into water?

The light slows down to a speed equal to 3/4 of its original value

Explanation:

The speed of light in a medium is given by:

where

is the speed of light in a vacuum

n is the index of refraction of the medium

For light entering air, we have that the light enters a medium with index of refraction of

Therefore, its speed changes as follows

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