An object is kept at infinity from the position of a concave (spherica

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An object is kept at infinity from the position of a concave (spherical) mirror. Which one is *not* true about the image of the object?

Position of image is at the focus of the mirror
Size of image is the same as that of the object
Image is real
Image is inverted
This question was previously asked in
UPSC CISF-AC-EXE – 2020
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When an object is placed at infinity from a concave spherical mirror, the light rays from the object are considered to be parallel to the principal axis. After reflection from the concave mirror, these parallel rays converge at the principal focus (F) of the mirror. The image formed at the focus is real, inverted (relative to the infinitely distant object), and highly diminished (essentially a point image).
For an object at infinity from a concave mirror, the image is formed at the focus, is real, inverted, and highly diminished (point-sized).
Option A states the position of the image is at the focus, which is true. Option C states the image is real, which is true for converging rays formed on the same side as the object. Option D states the image is inverted, which is true for real images formed by a concave mirror (even though a point image doesn’t visually appear inverted). Option B states the size of the image is the same as that of the object, which is false; the image is highly diminished. Therefore, the statement that is *not* true is B.

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