When a ray of light enters a glass lens surrounded by air, it slows down. Part A

Question

When a ray of light enters a glass lens surrounded by air, it slows down.
Part A:As it leaves the glass, does its speed increase, decrease, or stay the same?
Part B:Choose the best explanation from among the following:

The speed will stay the same because the speed of light is a universal constant.

The speed decreases because the speed of light decreases whenever light moves from one medium to another.

Its speed increases because the ray is now propagating in a medium with a smaller index of refraction.

Explanation / Answer

A) increase Its speed increases because the ray is now propagating in a medium with a smaller index of refraction.

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