Explanation:

As the object is moved from infinity towards the pole of a concave mirror the image shifts from the focus of the mirror to infinity. When the object is at infinity, the image is formed at the principal focus or in the focal plane. size of image is diminished

When the object is moved from infinity towards the pole of a concave mirror, the image shifts from the focus of the mirror to infinity. When the image is at infinity, the image formed at the principal focus or in the focal plane is diminished.

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