Question

4) Distinguish between :
Concave lens & Convex lens​

Answer 1

#Answer#

A convex lens is thicker at the centre and thinner at the edges. A concave lens is thicker at the edges and thinner at the centre. Due to the converging rays, it is called a converging lens. ... It is also called a positive lens due to positive focal length nature.

Answer 2

Answer:

Convex Lens : In a convex lens (sometimes called a positive lens), the glass (or plastic) surfaces bulge outwards at the centre. A convex lens is also called a converging lens because the parallel light rays moving through it curves inward and touches (converges) at a position just beyond the lens known as the focal point.

Concave Lens : With external surfaces curving inside, a concave lens is just the opposite, making parallel light rays curve outwardly or diverge. Therefore concentric lenses are sometimes referred to as divergent lenses. The disparity between concave and convex lenses will clearly be understood when contemplating the concave lens internally.