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JEE Main 2021 (24 Feb, Shift 1) · Reflection & Mirrors

Reflection & Mirrors question from JEE Main 2021 (24 Feb, Shift 1)

Q30JEE Main 2021 · 24 FEB · SHIFT 1Easy

Reflection & Mirrors

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

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Answer: (c)

For any spherical mirror the focus is midway between the pole and the centre of curvature.
For a convex mirror both $f$ and $r$ are positive (behind the mirror), so $f = +\frac{1}{2}r$ .
So the answer is (c).

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