Regarding a plane mirror, which statement is correct?

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1. Regarding a plane mirror, which statement is correct?

Its focal length is exactly zero

An object’s image is always slightly smaller than the object itself

The image is virtual, erect, and laterally inverted

Its focal length is exactly 200 cm

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A plane mirror always produces a virtual, upright image that is laterally inverted — left and right appear swapped, though up and down do not.