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. $t(1-\frac{1}{\mu })away$
• B. $t(1+\frac{1}{\mu })away$
• C. $t(1-\frac{1}{\mu })nearer$
• D. $t(1+\frac{1}{\mu })nearer$

Answer 1

The correct option is A $t(1-\frac{1}{\mu })away$

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