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  4. The focal length f is related to the radius of curvature r of the spherical convex mirror by:

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Q. The focal length $f$ is related to the radius of curvature $r$ of the spherical convex mirror by:

JEE MainJEE Main 2021Ray Optics and Optical Instruments

Solution:

For convex mirror, focus is behind the mirror,
image
$\Rightarrow f = + \frac{r}{2}$