Question

The value of g will be 1% of its value at the surface of earth at a height o

Answer 1

PHYSICS

The refractive index of glass is 1.5 and velocity of light in vacuum is 3× 108 m/s. Time taken by light in traveling 500 m in glass will be:

A

1μs

B

1.5μs

C

4.5μs

D

2.5μs

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ANSWER

Given,ng=1.5,nvacuum=1 and velocity of light in vacuum is 3×108.

Velocity of light in glass is :

ngvv×nv

=1.53×108×1

=2×108.

Therefore, time taken by light in travelling 500m in glass is 2×108500

=2.5 μs