Two objects and

PHYSICS · Single correct · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction

Problem

Two objects

A

and

B

, when placed in turn in front of a concave mirror of focal length

7.5\,\text{cm}

, give images of equal size. If

A

is three times the size of

B

and is placed

30\,\text{cm}

from the mirror, what is the distance of

B

from the mirror? (a)

10\,\text{cm}

(b)

12.5\,\text{cm}

(c)

15\,\text{cm}

(d)

17.5\,\text{cm}