Q 12-09-156JEE MainJEE Main 2021 (24 Feb, Shift 1)Easy
The focal length $f$ is related to the radius of curvature $r$ of the spherical convex mirror by:
Answer: (B) $f = +\frac12 r$
For a spherical mirror $f = r/2$. For a convex mirror both the focus and the centre of curvature lie behind the mirror, taken as positive in the usual convention, so $f = +\dfrac12 r$.
Solution by Sreeraj P, M.Sc Physics