question_answer

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

Answer:

For converging lens, the refractive index (\[\mu \]) of the material of the lens is greater than the refractive index of air.

For diverging lens, the refractive of the material of the lens less than the refractive index of water.