Question

define concave and convex lences

Answer 1

A convex lens is thicker at the centre than at the edges. Convex lenses are thicker at the middle. Rays of light that pass through the lens are brought closer together (they converge). A convex lens is a converging lens.

A concave lens is any lens that has an inward curve in the middle. In other words, the edges of the lens are thicker than the middle. This causes light that enters the lens to spread out, or diverge. In effect, this makes images appear smaller when viewed through a concave lens.

Answer 2

Answer:

A lens which is thinner in the middle and thicker at the edges is called concave lens.

A lens which is thicker in the middle and thinner at the edges is called convex lens.