JEE PYQ: Ray Optics Question 49
Question 49 - 2019 (11 Jan Shift 2)
A monochromatic light is incident at a certain angle on an equilateral triangular prism and suffers minimum deviation. If the refractive index of the material of the prism is $\sqrt{3}$, then the angle of incidence is:
(1) 90$°$
(2) 30$°$
(3) 60$°$
(4) 45$°$
Show Answer
Answer: (3)
Solution
For minimum deviation: $r_1 = r_2 = \frac{A}{2} = 30°$ by Snell’s law $\mu_1 \sin i = \mu_2 \sin r$ $1 \times \sin i = \sqrt{3} \times \frac{1}{2} = \frac{\sqrt{3}}{2} \Rightarrow i = 60°$
BETA
