Question

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

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

Answer 1

Answer: (A)

As ${\mu }_2>{\mu }_1,$ the upper half of the lens become diverging and as ${\mu }_1>{\mu }_3,$ the lower half of the lens become converging.