calculate the angle of incidence ray if the reflected ray is at an angle of 120 degree to the incidence ray
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If we consider the surface is flat surface (ideal), then total angle is 180°. Then if the angle between the Incident Ray and Reflected Ray is 120° then we are left with (180° - 120°) = 60°. This 60° is equally divided between the Incident Ray and the Reflected to follow the Laws of Reflection
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