Rays from Sun converge at a point `15 cm` in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object ?

Options

A. ` 15 cm` in front of the mirror
B. `30 cm` in front of the mirror
C. between `15 cm and 30 cm` in front of the mirror
D. more than `30 cm` in front of the mirror

Answer

B

Explanation

As rays from the sun converge at `15 cm, :. f = 15 cm`.
Size of image = size of object, when object is placed to `R = 2f = 30 cm` in front of the mirror.