Question

If you ray incident normally on a plane mirror what will be the angle of reflection

Answer 1

Normal is defined  as a perpendicular drawn to surface of plane mirror   . Which is sane plane as that of incident and the reflection  ray                                        If light is fall normally on a plane mirror  ,then angle of incident  is zero degree then angle of reflection also zero It is According to the law of reflection  Angle i = angle r        So angle of reflection will be zero it means  it is reflected back on same path