How does the speed of light determine the optical density of a medium?
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A medium is said to be denser if the speed of light in it decreases, while it is said to be rarer if the speed of light in it increases.
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What do you understand by refraction of light?
Which is optically denser: water or air? Give reason.
Out of air and glass, which is optically rarer? Give reason.
State the speed of light in:
(a) air
(b) water and
(c) glass.