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Question

Que. (A) The refractive index of glass is 1.5. What is the speed of light in glass? ( speed of light in vacuum is 3.0×108ms1)
(B) Is the speed of light in glass independent to the colour of light? Which of the two Colour red and violet travels slower in glass prism?

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Solution

The relation between redfractive index and speed is as follows

n=cv where c is the velocity of light and v is the velocity of light in glass.

So,

1.5=3×108v

v=2×108m/s



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