Question

The focal length of a convex mirror is ________ its radius of curvature.

• A. equal to
• B. half of
• C. two times
• D. negative of

Answer 1

The correct option is B half of

For any spherical mirror, radius of curvature ( $R$ ) is equal to twice the focal length ( $f$ ).

So, $f=\frac{R}{2}$ or focal length of a convex mirror is half of its radius of curvature.