Question

A lens behaves as a converging lens in air and a diverging lens in water (u = 4/3). What will be the condition on the value of refractive index (u) of the material of the lens ?

Answer 1

A lens behaves as a converging lens in air and a diverging lens in water (u = 4/3). It means refractive index of the material of lens is less than the refractive index of water. 

Answer 2

Answer:

AAlens behaves as a converging lens in air and diverging lens iinwater the refractive index of lens is