# 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

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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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x=(t)/(lambda//n_1) …(i)
y=(t)/(lambda//n_2) …(ii)
x/y=n_1/n_2