According to the law of reflection in a plane mirror, incident , the point of pncidence of the incident ray on the surface of the mirror , the normal drawn to the surface of the mirror at the point of incdence and the reflected ray from the mirror are all lying inthe same plane. Also the angle incident ray makes with the normal is equal to the angle the reflected ray make with the normal.
If IO is the incident ray, ON is the normal at the point of incidence, and OR, is the reflected ray, then , IO,ON and OR are all in the same plane.
Also, angle ION is the angle of incidence.
NOR is the angle of reflection,
Then angle ION = angle NOR.
In this case angle IOR = 90-30 =60.
Therefore angle of reflection = NOR = 60 degree.
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