Question 35
Refraction of LightCalculate the refractive index of the material for the glass prism in the diagram above.
- A.√2
- B.3/2
- C.2/3
- D.4/3
Show the answer and explanation
Answer: A (√2)
Explanation
The ray passes through symmetrically (minimum deviation) with A = 60° and D = 30°: n = sin((60 + 30)/2) ÷ sin(60/2) = sin 45° ÷ sin 30° = √2.