Question

What is the nature of image formed in:
a. Concave lens
b. Convex lens
Also, give one use of each lens.

Answer 1

Convex lens: A converging lens can produce both virtual and real image. It depends on the position of the object placed in front of the lens.
Concave lens: A diverging lens can only produce a virtual image. That is, when parallel rays of light fall on a concave lens they diverge as they pass through the lens never to meet at a point.
Use of convex lens: A refracting telescope uses two convex lenses.
Use of concave lens: Most high-quality cameras, telescopes and binoculars use concave lenses to improve the quality of the images they provide.