Question

Under which condition convex lens act as a diverging lens

Answer 1

Condition: When a convex lens is placed inside a liquid of refractive index greater than that of the material of the lens, it behaves like a diverging lens.

Answer 2

A convex lens can behave as a diverging lens when it is placed in a medium whose refractive index is greater than the refractive index of the material of the lens