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An object 5 cm tall is placed 20 cm from a convex mirror with radius of curvature 30 cm. What is the focal length of this mirror?

Question
An object 5 cm tall is placed 20 cm from a convex mirror with radius of curvature 30 cm. What is the focal length of this mirror?
f = -15 cm
f = +15 cm
f = +30 cm
f = -30 cm
Answer
f = +15 cm
Detailed Explanation
For a convex mirror, f = R/2 = +30/2 = +15 cm (positive, as the focus is behind the mirror).
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