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doit_the_clown doit_the_clown
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7 years ago
Light enters the smooth flat surface of a block of glass from the vacuum of space (e.g., a spacecraft window). What is the speed of light inside the glass compared to that in vacuum?
A)   The speed will depend on the angle that the light ray makes with the perpendicular to the surface, becoming slower as the angle increases.
B)   The same because the speed of light is always constant, by definition
C)   Faster because the glass is denser than the vacuum
D)   Slower because the glass is denser than the vacuum
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Discovering the Universe

Discovering the Universe


Edition: 7th
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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