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
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B
1.5μs
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C
4.5μs
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D
2.5μs
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Solution
The correct option is D2.5μs Given,ng=1.5,nvacuum=1 and velocity of light in vacuum is 3×108. Velocity of light in glass is : vv×nvng =3×108×11.5 =2×108. Therefore, time taken by light in travelling 500m in glass is 5002×108 =2.5μs