Physics

Problem

A concave mirror has a focal length of

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