Question

why do we say that a plane mirror form a virtual image of an object

Answer 1

because the light emerges from the object's body appears to meet behind the mirror. They are not actually meet.
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Answer 2

HI .........
SIMRAN HERE.......

HERE'S THE ANSWER TO YOUR QUESTION......

The image formed by a plane mirror is always virtual (meaning that the light rays do not actually come from the image), upright, and of the same shape and size as the object it is reflecting. A virtual image is a copy of an object formed at the location from which the light rays appear to come.

HOPE IT HELPS...........
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