An object is 50 cm from a concave mirror with radius of curvature of magnitude 60 cm.What is the lateral magnification produced by the mirror?
A)+0.40
B)+0.70
C)+1.5
D)-0.70
E)-1.5

Question

Quizplus · Accepted Answer

The mirror formula is 1/f = 1/v + 1/u, where f is the focal length, v is the image distance, and u is the object distance. The focal length f is half the radius of curvature, so f = -30 cm (negative for concave mirror). Using the mirror formula with u = -50 cm, we find v = -75 cm. The magnification m is given by m = -v/u = -(-75)/(-50) = -1.5.

An Object Is 50 Cm from a Concave Mirror with Radius