The refractive indexes of glass and water with respect to air are 3/2 and 4/3 respectively. If speed of light is 2 x 10^8 m/s, find the speed of light in water.

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Solution

Given that Refractive index of glass = 3/2 refractive index of water = 4/3. Speed of light in glass = 210^8 m/s Therefore, the speed of light in vacuum = refractive index of glass speed of light in glass speed in vacuum = (3/2)(210^8) = 310^8 m/s in the same way, speed of light in vacuum = refractive index of water * speed of light in water 310^8 = (4/3) speed of light in water speed of light in water = 3310^8 / 4 speed of light in water = 910^8 / 4 speed of light in water = 2.2510^8 m/s. I hope it is clear to you

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Q. The refractive indices of glass and water with respect to air are

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and

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respectively. If the speed of light in glass is

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3 / 2

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(a) State the laws of refraction of light. Give an expression to relate the absolute refractive index of a medium with speed of light in vacuum.

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