Question

Two lenses of focal length +20 and -20 . Find the nature of each of the lenses and which lense give virtual and magnified image ?

Answer 1

Hey mate!

The lens having focal length -2 is convex and +2 is concave.

Convex lens (-2) are used to view the distant objects while the concave lens (+2) are used to view the near objects..

The convex lens gives real and inverted image.

The concave lens gives virtual, erect and magnified image.

Hope this helps you :-)