Question

Which one convex lens or concave lens will have positive magnification?. If convex lens, then why or concave lens , then why?

Answer 1

Due to sign convention the focal length of convex lens is positive

Answer 2

Explanation:

convex lens of focal length 10 cm is in contact with a concave lens. The focal length of the combination is numerically equal to that of the concave lens. The focal length of the concave lens is