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A beam of light is converging towards a ...

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

A

`t(1-1/mu)` away

B

`t(1+1/mu)` away

C

`t(1-1/mu)` nearer

D

`t(1+1/mu)` nearer

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The correct Answer is:
a
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