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Two optical media of refractive indices ...

Two optical media of refractive indices `n_1` and `n_2` contain `x` and `y` waves of the same colour in the same Ihickness. Then their relative refractive index `^1n_2` is equal to

A

`x/(y-x)`

B

`x-y`

C

`y/x`

D

`(y-x)/x`.

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