Which is optically denser: water or air? Give reason.
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Water is optically denser than air because speed of light in water (2.25 x 108 m s-1) is less than speed of light in air (3 x 108 m s-1).
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Out of air and glass, which is optically rarer? Give reason.
How does the speed of light determine the optical density of a medium?
What do you understand by refraction of light?
State the speed of light in:
(a) air
(b) water and
(c) glass.