What is the minimum distance of the real image of the object formed by a concave mirror?

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The distance between the pole and the centre of curvature

The distance between the pole and the principal focus

The distance between the principal focus and the centre of curvature

None of the above

answer is B.

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Detailed Solution

The minimum distance of the real image of the object formed by a concave mirror is the distance between the pole and the principal focus.
Real and virtual images are formed when light is incident on a concave mirror. Real images are formed when the object is kept at infinity, beyond the centre of curvature, at the centre of curvature, or between the centre of curvature and the principal focus and at the principal focus. The only case when the virtual image is formed is when the object is kept between the pole and the principal focus. Hence, the minimum distance between an object and its real image formed by a concave mirror is when the object is kept at a distance equal to the principal focus of the mirror.

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