Question

You are given two lenses A and B of focal length 10cm and -10cm
respectively. State the nature and power of each lens. Which of the
two lenses will form a virtual and magnified image of an object placed
8cm from it.​

Answer 1

Explanation:

It is to remember that focal length of convex lens are positive & focal length of concave lens are negative.

And convex lens will form virtual & magnified image when object is in b/w focus & pole of lens.