The image formed by concave lens is always: Virtual, Erect and Diminished. Case 1: When an object is placed anywhere between optical centre and infinity, the image formed is between optical centre ...

In a telephoto lens, the magnification of the subject is achieved through a combination of convex and concave lenses. In its simplest form, a convex lens on the outside converges light.

Lenses are used in cameras, telescopes, binoculars, microscopes and corrective glasses. A lens can be converging (convex) or diverging (concave).

Unit 6 Segment L: Spherical Mirrors The properties of spherical mirrors are discussed.