If light falls perpendicularly on a plane mirror, what will be the angle in which it will be reflected?

Options : 45o, 90o, 180o, 360o

(Please note that angle of reflection is not what is being asked.)

It will be reflected along 1800  to that of  incident light i.e., it will be reflected back along the same path along which it is incident.

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i suppose 90 degree

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