Question

what is the image distance and image height if a 7 cm tall object is placed is 50 cm from a concave mirror having a focal lenght of 10 cm long?

Answer 1

$$\frac{1}{f}=\frac{1}{d_0}+\frac{1}{d_i}\to \frac{1}{10}=\frac{1}{50}+\frac{1}{d_i}$$

$$d_i=12.5\ cm$$

$$m=-\frac{12.5}{50}=-0.25$$

$$h_i=mh_o=-0.25(7)=-1.75\ cm$$