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:
(a) y, p, z
(b) x, q, z
(c) p, y, z
(d) p, z, y
Answer

Angle of incidence
is the angle between incident ray and normal.
Here, incident ray is on the right side (check arrows).
So, here angle of incidence is angle p

Angle of emergence
is the angle between emergent ray and normal.
Here, emergent ray is on the left side (check arrows).
So, here angle of emergence is angle y

Angle of deviation
is the angle between emergent ray and incident ray (when produced backwards).
So, here angle of deviation is angle z
So, the correct answer is (c)  p, y, z
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