Question

difference between covex lens and concave lens in points

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

convex lens is thin at edges but thick at the centre.....
and concave lens is thick at edges but thin at centre.....

the lens are transparent through light can pass