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A beam of light is converging towards a ...

A beam of light is converging towards a point P on a screen. A plane parallel plate of glass of thickness in the direction of beam `= t`, refractive index `= n` is introduced in the path of the beam. The convergence point is shifted by

A

`t(n-1)`

B

`t(n+1)`

C

`t(1-1/n)`

D

`t(1+1/n)`.

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