Teaching UP TGT Mock Test Series 2025 Physics Optics Mirrors and Images

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

1
\(\rm f=+\frac{1}{2} r\)
2
f = −r
3
\(\rm f=-\frac{1}{2} r\)
4
f = r
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