A circular coin is 33.3 cm from a concave spherical mirror.(Assume the coin is on the optical axis.)The image of the coin is produced 10.0 cm from the mirror and on the same side as its real position.If the coin is moved to a position 23.3 cm from the mirror,calculate how far from the mirror the new image is:
A)13.7 cm
B)10.0 cm
C)15.1 cm
D)8.35 cm
E)11.5 cm

Question

Quizplus · Accepted Answer

Using the mirror equation (1/f = 1/do + 1/di), we first find the focal length with the initial conditions (do = 33.3 cm, di = 10.0 cm). Then, using the new object distance (do = 23.3 cm), we solve for the new image distance (di), which is approximately 11.5 cm.

A Circular Coin Is 33