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.