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

Options

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

Answer

A

Explanation

shift is always `(1-(1)/(mu))`in the direction of incident ray.