For an object at infinity, a concave mirror produces an image at its focus which is:

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Virtual

Erect

Real, inverted and diminished

answer is D.

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Detailed Solution

Concept: A concave mirror produces a real, inverted, and diminished image of its focus for an object at infinity. Because all rays appear to be parallel to the main axis.
When an object's parallel rays are reflected by a mirror, they pass through the focus.
So, any parallel rays emitted by an object after reflection in a concave mirror pass through the focus of the mirror. As a result, images formed at focus have a point size.
Because an image is formed by converging rays in front of the mixture, it is the true image.
As a result, the formed image is real, inverted, and reduced.
Hence, the correct option is 4.

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