Question

Name the different apparatus where we are using the convex and concave
lenses.

Answer 1

convex mirror are used as fish eye mirror. concave mirror are used as converging mirror

Answer 2

Most high quality cameras, telescopes and binoculars use concave lenses to improve the quality of the images they provide.
 Microscopes and reflecting telescopes make use of a concave mirror, a plane mirror, and a convex lens, while refracting telescopes use two convex lenses.