Question

When concave lens of glass is immersed in water it works as

Answer 1

It works as convex lens

Answer 2

When concave lens of glass is immersed in water then its power Increases.

Explanation:

When concave lens of glass is immersed in water,

then the refractive index increases

we know refractive index is directly proportional to power of concave lens.

hence its power also increases

the speed of light in air is maximum and when it enters glass lens there will be sudden change in its speed.

the amount by which the direction change depends on the difference between the two refractive indices.