Question

A convex lens of reflactive index 1.5 is immersed in water of reflective index 1.33 it will behave as

Answer 1

Answer:

A convex lens made up of glass of refractive index 1.5 is dipped, in turn, in:

(i) Medium A of refractive index 1.65

(ii) Medium B of refractive index 1.33

i) Focal length fA in medium A of refractive index 1.65 is given by

As fA is negative, the lens is diverging.

(ii) Focal length fB in medium B of refractive index 1.33 is given by

As fB is positive, the lens is converging.