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.
