Question

What is the speed of light in crown glass with refractive index 1.52?

Answer 1

It is the refractivness of light when it enters the crown glass .

Let the speed of light in crown glass be n

Refractive index of crown glass =speed of light in air/speed of light in crown glass

1.52=3×10^8/n

n=3×10^8/1.52

n=2×10^8

Therefore the speed of light in crown glass is 2×10^8

Answer 2

Answer:

here 1.52 nothing but 1.5

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