Question

A double convex lens, made of a material of refractive index ${\mu }_1$, is placed inside two liquids of refractive indices ${\mu }_2$ and ${\mu }_3$ as shown. ${\mu }_2$ > ${\mu }_1$ > ${\mu }_3$. A wide, parallel beam of light is incident on the lens from the left. The lens will give rise to

• A. a single convergent beam
• B. two different convergent beams
• C. two different divergent beams
• D. a convergent and a divergent beam

Answer 1

The correct option is D a convergent and a divergent beam

$\therefore$ analyzing the rays it gives a divergent ray above the axis and

convergent ray below ${\mu }_2>{\mu }_1>{\mu }_3$

from medium 2

$\Rightarrow$ when light ray enters into medium $1\left({\mu }_1\right)$ then moves away from normal

from medium 3

$\Rightarrow$ when light ray enters into medium $1\left({\mu }_1\right)$ the moves towards the normal.
Hence, the correct option is $\left(D\right)$