The angle of reflection is 60 degrees.

This is because angle of incidence = angle of reflection,

and the normal bisects the whole angle ie. angle of incidence + angle of reflection.

hence, if complete angle = 120 degree

angle of reflection = 60 degree.


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See the attachment.
i = angle of incidence
r = angle of reflection

The\ angle\ between\ incident\ ray\ and\ reflected\ ray =120^0 \\  \\ \angle i\ + \angle r=120^0\\ \\from\ laws\ of\ reflection\ \angle i\ = \angle r\\ \\so\ \angle i\ + \angle r=120^0\\\angle r\ + \angle r=120^0\\ 2\angle r=120^0\\ \angle r= \frac{120^0}{2}\\ \angle r=\boxed {60^0}  
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