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

Question

44) When a ray of light enters a glass lens surrounded by air, it slows down. a) as it leaves the glass, does its speed increase, decrease or stay the same? b) choose the best explanation from among the following:
I. Its speed increases because the ray is now propagating in a medium with a smaller index of refraction
II. The speed decreases because the speed of light decreases whenever light moves from one medium to another
III. The speed will stay the same because the speed of light is a universal constant.

Explanation / Answer

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

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