Question

explain concave and convex ??

Answer 1

concave means curve outward and convex means curve inward...i hope this help u

Answer 2

1.a convex lens converges a beam of parallel rays falling on it. convex lens is thinner at edges and thicker in middle. 2.the beam of parallel rays incident on this lens diverges after refraction. a concave lens is thicker at the edges and thinner at the center