Question

what is convex lens and concave lens​

Answer 1

Answer:

Convex lens is also known as converging lens. They bulge towards you making light rays focus on a focal point. It is used to correct long sightedness (Hypermyopia).

Concave lens also known as diverging lens bulges away from you and makes the light rays focus directly on the retina. It is used to correct short sightedness (Myopia).

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Answer 2

Convex Lens:- A lens which is thicker at the centre and thinner at its end is called convex lens.

Concave lens:- A lens which is thinner at the centre and thicker at its ends is called a concave lens.