Question

What is concave and convex lens

Answer 1

lens which is bulged inwards is called concave lens
lens which is bulged outward is called convex lens

they have their ow uses as concave can be used for myopic eye and convex for hypermetropic eye defects

Answer 2

concave lens are thinner at the middle and concave lens are thinner at the side by concave lens you can see bigger and wider while by convex smaller