Question

5.What happens to the speed of light when it passes from air into glass?
It increases
It does not change
It decreases
None of these
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Answer 1

Explanation:

That last example can be argued with! Some people say to remove parentheses to make it "simpler", but (x−3)(x+1) is usually a lot easier to use.

The moral of the story:

Answer 2

Answer:

Light is refracted when it crosses the interface from air into glass in which it moves more slowly. Since the light speed changes at the interface, the wavelength of the light must change, too. The wavelength decreases as the light enters the medium and the light wave changes direction.