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

f = r

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f = - \frac{1}{2} r

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f = + \frac{1}{2} r

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f = - r

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Solution

The correct option is C $f = + \frac{1}{2} r$
As per sign convention, we take the focal length of a spherical convex mirror to be positive, and it is half of the radius of curvature.
$∴ f = + \frac{1}{2} r$

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

The correct option is C f=+12rAs per sign convention, we take the focal length of a spherical convex mirror to be positive, and it is half of the radius of curvature. ∴f=+12r

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

The correct option is C $f = + \frac{1}{2} r$
As per sign convention, we take the focal length of a spherical convex mirror to be positive, and it is half of the radius of curvature.
$∴ f = + \frac{1}{2} r$