Question

A concave mirror with a focal length of 10.0 cm creates a real image 30.0 cm away on its principal axis. How far from the mirror is the corresponding object?





a. 20 cm



b. 15 cm



c. 7.5 cm





d. 5.0 cm

Answer 1

The answer is 15 cm. For this question, we need to use the mirror formula.