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:

(A) $ y,p,z $
(B) $ x,q,z $
(C) $ p,y,z $
(D) $ p,z,y $

Answer 1

Hint :Here, we have to understand the concept of prism and when light passes through the prism when incident at an angle of incidence, and emerges at the angle of emergence. Also the deviation of the incident ray takes place at some angle in the prism; this angle is known as the angle of deviation.

Complete Step By Step Answer:
Let us first discuss the terms of angle of incidence, angle of emergence and angle of deviation as:

Angle of incidence: the angle between the incident ray and the normal to the surface of the prism at which the ray of light is incident is known as the angle of incidence.
In the above figure we can see that the ray of light is entering the prism at an angle $ p $ .
So the angle of incidence is $ p $ .
Angle of emergence: The angle from where the ray is going out from the prism is called angle of emergence. It is the angle formed between the ray of emergence and normal to the surface from where the ray is emerging.
In the above figure we note that the angle of emergence is $ y $
So, the angle of emergence is $ y $ .
Angle of deviation: The angle at which the ray is deviated from the incident angle then this angle is known as the angle of deviation.
In the above figure we see that the angle of deviation is given by $ z $ .
Hence, the required answer is $ p,y,z $
The correct answer is option C.

Note :
Here, we have to study the diagram given below and apply the concepts we know about the angle of incidence, angle of emergence and angle of deviation. Applying these concepts we can find the required answer as above.