Question

A beam of light is converging towards a point $t$, refractive index = $\mu$, is introduced in the path of the beam. The convergence point is shifted by

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

Answer 1

Answer: (A)

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

Answer 2

Normal shift $\Delta x = \left( 1 - \frac { 1 } { \mu } \right) t$

and shift takes place in direction of ray.