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 and z
(B) x, q and z
(C) p, y and z
(D) p, z and y
Answer

The
angle between
the
incident ray
and the
normal
is known as the
angle of incidence
.
This is angle y in our figure
 The angle between the emergent ray and the normal is known as the angle of emergence .
This is
angle y
in our figure
 The angle between emergent ray and incident ray produced backwards is called the angle of deviation .
So, the correct answer is (c) p, y and z
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