Question

`what \: is \: plane \: mirror \: \: \: {?}`
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Answer 1

any smooth surface which can return back the rays of light in to the same medium is called a plane mirror.

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Answer 2

>>> A plane mirror has a reflective surface that is flat (planar). The angle of reflection equals the angle of incidence for light rays striking a planar mirror. A virtual picture is a representation of an object created at the spot where light rays appear to originate.

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