What is the use of convex and concave lenses..?
Concave lenses work to make something look smaller, so they’re not quite as common as convex (magnifying) lenses. But they’re still used in a lot of different things. For example, eyeglasses have one convex surface and one concave surface. Between the two, the glasses can bend the light just the right amount before it gets to your eyes. One very useful thing about concave lenses is that they can help to make details look clearer. So they are often used together with convex lenses in ’optical systems’ to help clear up any details that are lost due to aberations (flaws) in the convex lens. For example, many high quality telescopes and binoculars use concave lenses to improve the detail of the images they provide.
