Optics Question 716

Question: 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

[MNR 1987]

Options:

A) $ t( 1-\frac{1}{\mu } ) $ away

B) $ t( 1+\frac{1}{\mu } ) $ away

C) $ t( 1-\frac{1}{\mu } ) $ nearer

D) $ t( 1+\frac{1}{\mu } ) $ nearer

Show Answer

Answer:

Correct Answer: A

Solution:

Normal shift $ \Delta x=( 1-\frac{1}{\mu } )\ t $ and shift takes place in direction of ray.



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