When light travels from air to glass, what happens to its speed?

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Accepted Answer

1. Light enters glass from air, so it goes into a denser medium.

2. Glass has a higher refractive index $n>1$.

3. Speed in a medium is $v=\dfrac{c}{n}$, where $c$ is light speed in vacuum.

4. Because $n$ for glass is larger than for air, $v$ in glass is smaller. Thus the speed **decreases**.

FINAL_ANSWER: b

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