A highly polishes plane surface which reflects light regularly is called a plane mirror. Image is formed as the light returns to the first medium when it just falls on the other surface of the second medium.
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In 'a' plane mirror only 'one' image is formed.
A virtual erect image of the same size of the object is formed.
The image formed in a plane mirror is virtual, and equal in size to the object. so the size of Nishas image will also be 165cm, equal to her own size
virtual :-)
The distance of the object from the mirror line should equal the distance of the image from the mirror line.