Question

When a convex lens will act as magnifying glass ? ​

Answer 1

Explanation:

A convex lens will act as magnifying glass, when a object is place between focal length and optical centre.

Answer 2

Answer:

A convex lens (Converging lens) acts as a magnifying glass only if the object against it is placed between its focus and the optical centre.

This is because, due to the placement of the object too much near to the lens, the rays converge in such a way, that it meets on the same side of the lens, and thus forming a virtual and magnified image of the object.

Refer the attachment for the ray diagram of this case in a convex lens.