Question

A hollow double concave lens is made of very thin transparent material. It can be filled with air or either of two liquids $L_1$ and $L_2$ having refractive indices $n_1$ and $n_2$ respectively $(n_2>n_1>1).$ The lens will diverge a parallel beam of light it is filled with:

• A. air and placed in air
• B. air and immersed in $L_1$
• C. $L_1$ and immersed in $L_2$
• D. $L_2$ and immersed in $L_1$

Answer 1

The correct option is D $L_2$ and immersed in $L_1$

If lens materials are surrounded by rarer medium it acts as rarer as diverging lens.