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Question:

Study the following ray diagram: In this diagram, the angle of incidence, the angle of emergence and the angle of deviation respectively have been represented by y, p, z

y, p, z

p, y, z

p, z, y

x, q, z

Solution:

It is clear from the diagram,
Angle of incidence=p
The angle of incidence is the angle between the incident ray and the normal.
Angle of emergence=y
The angle of emergence is the angle between the angle between the emergent ray and the normal.
And Angle of deviation=z
The Angle of emergence is angle between the incident ray and the emergence ray.
So the proper sequence is p,y,z