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The ratio of thickness of plates of two ...

The ratio of thickness of plates of two transparent medium A and B is 6 : 4. If light takes equal time in passing through them, then refractive index of A with respect to B will be

A

`1.4`

B

`1.5 `

C

`1.75`

D

`1.33`

Text Solution

Verified by Experts

The correct Answer is:
B

Time taken by light to travel distance x through amedium of refractive index `mu ` is
`t = (mu x)/c implies (mu_B)/(mu_A) = (x_A)/(x_B) = 6/4 implies A muB = 3/2`
`= 1.5`
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