Question

difference between concave and convex​

Answer 1

1)concave is used for see near objects and convex is used for see far objects.

2)concave are less used in glasses and convex is more used in glasses.

Answer 2

Explanation:

convex lense - it's focal length is positive

it can be correct defect of farsightedness. concave lense -its focal length is negative. it can be correct defect of nearsightedness