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
A. `t(1-(1)/(mu))` away
B. `t(1+(1)/(mu))` away
C. `t(1-(1)/(mu))` nearer
D. `t(1+(1)/(mu))` nearer

Answer 1

Correct Answer - A
Normal
shift `Deltax=(1-(1)/(mu))t` and shift takes place in direction of ray.