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 in the figure. ${\mu }_2>{\mu }_1>{\mu }_3$. 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 divergent beam

Answer 1

Answer: (D)

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