Question

what is angle of incidence of a may if a get of reflected ray is 90 to incidence ray

Answer 1

The angle of incidence will be 45°...

Answer 2

The angle of incidence will he 45 degrees because a.o.r=a.o.i.

And accroding to you a.o.r+a.o.i =90

Therefore, a.o.i=90/2=45 degrees