Question

diffrence between concave and convex lens

Answer 1

Convex lenses are thicker at the middle. ... Rays of light that pass through the lens are spread out (they diverge). A concave lens is a diverging lens. When parallel rays of light pass through a concave lens the refracted rays diverge so that they appear to come from one point called the principal focus.

Answer 2

concave : thicker at the edges thinner in the center

convex : thicker in the center and thinner at the middle