Question

Defination of lenses & types of lenses in physics

Answer 1

Lenses --- a transparent material with curved sides for concentrating or dispersing light rays , as in microscope or even telescope...
there are many types of lenses ....
1 convex lens as in magnifying glass.
2 concave lens
3.biconvex lens
4.nimrud lens.etc


hope it helps

Answer 2

3 types of lens concave convex and bifocal lens...