A concave mirror has a focal length of

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

Problem

12\,\text{cm}

. To obtain an erect image three times the size of the object, at what distance from the mirror should the object be placed? (a)

8\,\text{cm}

in front of the mirror (b)

24\,\text{cm}

in front of the mirror (c)

16\,\text{cm}

in front of the mirror (d)

4\,\text{cm}

in front of the mirror