Question

how virtual image is formed by plain mirror
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Answer 1

Answer:

For light rays striking a plane mirror, the angle of reflection equals the angle of incidence. ... 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.

Explanation:

Answer 2

Answer:

A plane mirror is a mirror with a flat reflective surface. For light rays striking a plane mirror, the angle of reflection equals the angle of incidence. The angle of the incidence is the angle between the incident ray and the surface normal (an imaginary line perpendicular to the surface). Therefore, the angle of reflection is the angle between the reflected ray and the normal and a collimated beam of light does not spread out after reflection from a plane mirror, except for diffraction effects. Hence, the image formed is a virtual image.