Question 19 [OD-Set-1, 2016] - MCQ from Past Year Papers - Chapter 10 Class 10 - Light - Reflection and Refraction

In the following ray diagram, the correctly marked  angle are: 

(a) ∠i and ∠e

(b) ∠A and ∠D

(c) ∠i, ∠e and ∠D

(d) ∠r, ∠A and ∠D

Answer

• Angle of incidence is the angle between incident ray and normal.
  Here, angle of incidence is not with normal .   It is marked incorrectly
  
  
• Angle of refraction is the angle between refracted ray and normal.
  So, here angle of incidence is angle r. So, it is marked correct

• Angle of emergence is the angle between emergent ray and normal.
  Here, angle of emergence is not with normal .   It is marked incorrectly
  
  

• Angle of deviation is the angle between emergent ray and incident ray (when produced backwards).
  So, here angle of incidence is angle D. So, it is marked correct

• Angle of prism is the vertex angle of the prism.
  Here, it is angle A. It is marked correct
  
  

So, the correct answer is (b) -  ∠A and ∠D