Mirrors - GRE Subject Test: Physics
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Question
A reflective sphere has a diameter of 
. The surface of the sphere makes a convex spherical mirror; what is its focal point?
A reflective sphere has a diameter of
Answer
The focal length of a spherical mirror is one half of the radius, which is one quarter of the diameter. In the case of convex mirrors, the focal point is considered behind the surface, which gives the answer its negative sign.
The focal length of a spherical mirror is one half of the radius, which is one quarter of the diameter. In the case of convex mirrors, the focal point is considered behind the surface, which gives the answer its negative sign.
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