The pin method is used to prove the law of reflection in optics. The angle of incidence is equal to the angle of reflection. So here the angle of incidence is 30degree. Hence the angle of reflection is also 30 degree. But the angle between the incident ray and the reflected ray is 2*30=60 degrees. because|dw:1336132096754:dw| The images in the mirror are at the same distances as we see in the real object space
