Question

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

• 30 cm in front of the mirror

• 15 cm in front of the mirror

• Between 15 cm and 30 cm in front of the mirror

• More than 30 cm in front of the mirror

Answer 1

30 cm in front of the mirror

Explanation:-

If rays converge at a point 15cm from the mirror, then,

f = -15cm then, C = -30cm

An object kept at C makes an image of the same size as object.