Question

A lens behaves as a convergent lens in air and a diverging lens in water. the refractive index of the material of the lens is

• A. Equal to unity
• B. Equal to $\frac{4}{3}$
• C. Between unity and $\frac{4}{3}$
• D. Greater than $\frac{4}{3}$

Answer 1

The correct option is C Between unity and $\frac{4}{3}$

${\mu }_a<{\mu }_l<{\mu }_w,{\mu }_a=1{\mu }_w=\frac{4}{3}$