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"objects in the mirror may be closer than they appear"

If you think about it, it is a concave mirror giving wider field of vision. Concave mirrors give virtual smaller images.

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Convex mirrors will produce a smaller virtual image (behind the plane of the mirror) taken from a wider field of view. Concave mirrors will produce an inverted real image (for objects farther away than the focal length) or a larger virtual image (for objects inside the focal length).

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