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A convex mirror used for rear-view has a radius of curvature of 3.00 m. What is its focal length?

Question
A convex mirror used for rear-view has a radius of curvature of 3.00 m. What is its focal length?
3.00 m
1.50 m
6.00 m
0.75 m
Answer
1.50 m
Detailed Explanation
Using f = R/2 = 3.00/2 = +1.50 m (positive, since the convex mirror's focus is behind the mirror).
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