Answer to Question #279082 in Physics for xieess

Question

3. What is the image distance and image height if a 14.00 cm tall object is placed 30.0 cm from a concave mirror having a focal length of 20.0 cm?

Answer 1

By the mirror equation:

$\frac 1f=\frac 1o+\frac1i,\\\space\\ \frac 1{20}=\frac 1{30}+\frac1{i},\\\space\\ i=6\text{ cm}.$

Image height:

$h_i=-\frac ioh_o=-28\text{ cm (inverted)}$