A concave spherical mirror has a focal length of magnitude 20 cm.An object is placed 30 cm in front of the mirror on the mirror's axis.Where is the image located?
A)12 cm behind the mirror
B)12 cm in front of the mirror
C)60 cm behind the mirror
D)60 cm in front of the mirror

Question

Quizplus · Accepted Answer

Using the mirror formula, 1/f = 1/do + 1/di, where f is the focal length, do is the object distance, and di is the image distance, we can solve for di.

Substituting the given values, we get:

1/20 = 1/30 + 1/di

Solving for di, we get:

di = 60 cm

Since the image distance is positive, the image is located 60 cm behind the mirror. Therefore, the correct answer is D, 60 cm in front of the mirror.

A Concave Spherical Mirror Has a Focal Length of Magnitude