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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 =  , is introduced in the path of the beam. The convergence point is shifted by

1.           1 1 t away
2.           1 1 t away
3.           1 1 t nearer
4.           1 1 t nearer

Correct answer:           1 1 t away

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