Question

A beam of light is converging towards apoint $I$ 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. $t\left(1-\frac{1}{\mu }\right)$ 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)

Normal

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