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Two optical media of refractive indices `n_1` and `n_2` contain x and y waves of the same colour in the same thickness. Then their relative refractive index `n_1//n_2`
A. `x-y`
B. `x//y`
C. `(y-x)//x`
D. `x//(y-x)`

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Correct Answer - B
`x=(t)/(lambda//n_1)` …(i)
`y=(t)/(lambda//n_2)` …(ii)
`x/y=n_1/n_2`

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