Q 1247323283.     A thin sheet of mica (`12 × 10^(–7)`m thick) is placed in the path of one of the interfering beams in a biprism arrangement. It is found that the central bright band shifts a distance equal to the width of a bright fringe. Given that `λ = 6 × 10^(–7)` m , refractive index of mica is

A

`1.5`

B

`2`

C

`1.75`

D

`1.25`

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