Question

3. Determine the image distance and image height for a 5.00-cm tall object placed 20.0 cm

from a concave mirror having a focal length of 15.0 cm.

Answer 1

$$i=\dfrac{(-20)(-15)}{(-20)-(-15)}=-60\text{ cm}.\\\space\\ M=-5\dfrac{-60}{20}=15\text{ cm}.$$