(a) The angle of incidence = 90° – 30° = 60°
(b) Diagram showing the reflected ray is given below:
The angle between the incident ray and the reflected ray = angle of incidence + angle of reflection
As we know,
Angle of incidence = Angle of reflection = 60°
Therefore, we get,
60° + 60° = 120°
Hence, the angle between the incident ray and reflected ray = 120°