Question

A convex lens form a real and image of needle at a distance of 50cm from it. where is the needle placed in front of this image is equal to the size of the object? also find power of the lens

Answer 1

hope u understand the calculations yourself

Answer 2

The position of the image should be at 2F since the image is the real and same size.

It is given that the image of the needle is formed at a distance of 50 cm from the convex lens. Therefore, the needle is placed in front of the lens at a distance of 50 cm.