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

A

1.4

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B

1.5

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C

1.75

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D

1.33

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Solution

The correct option is B 1.5
By using $t = \frac{μ x}{c}$
$\Rightarrow \frac{μ_{B}}{μ_{A}} = \frac{x_{A}}{x_{B}} = \frac{6}{4} \Rightarrow_{A} μ_{B} = \frac{3}{2} = 1.5$

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