Question 15 [OD, Set-1, 2017] - MCQ from Past Year Papers - Chapter 10 Class 10 - Light - Reflection and Refraction

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