Answer to Question #211032 in Physics for Festus

Question

An object 5cm high is placed 20cm in front of a concave mirror so that it produces an image of 60cm from the mirror. Find the height of this image

Answer 1

The magnitude of magnification of the mirror is given by

$$m=\frac{d_i}{d_o}=\frac{h_i}{h_o}$$

Hence,

$$h_i=h_o\frac{d_i}{d_o}=(5\:\rm cm)*\frac{60\:\rm cm}{20\:\rm cm}=15\:\rm cm$$