Question

Under what condition a convex lens when placed
in a medium behaves as an ordinary glass
plate?


I REQUEST TO ANSWER IT PROPERLY

Answer 1

Explanation:

A lens works by the difference in the refractive index between the material of the lens and the surrounded medium. So a lens put in a medium that has the same refractive index would not be a lens rather behave as an ordinary glass plate and would not bend light at all.

Answer 2

When the refractive index of a medium relative to lens is one, a convex lens will behave as an ordinary glass plate.