Question

Rays from sun converge at a point 15cm in front of a mirror where should an object be placed so that size of its image is equal to the size of the object?

Answer 1

Answer:

It is given that sun rays converge at 15 cm. So, focal length of the mirror = f = 15 cm.

In case of a concave mirror, the size of image and object will be same if the object is placed at 2f.

Hence, in this case object must be place at 2f or 2 × 15 = 30 cm.