An object is placed 10 cm in front of a concave mirror with a 20-cm focal length.Determine the image location (in cm).
A)-20
B)-15
C)-10
D)-5
E)6.7

Question

Quizplus · Accepted Answer

The correct answer is A because the image location can be calculated using the thin lens equation: 1/f = 1/do + 1/di, where f is the focal length, do is the object distance, and di is the image distance. In this case, f = -20 cm (concave mirror), do = 10 cm, so di = -15 cm.

An Object Is Placed 10 Cm in Front of a Concave