Looking for classes? Ksquare Career Institute, Bengaluru →
Ray Optics and Optical Instruments
Refraction and Reflection at a Plane Surface – Brewster's Angle
1 question from 1 paper, each with its answer.
- question
- 1
- paper
- 1
- years asked, 2017–2026
- 1 of 10
- of Ray Optics and Optical Instruments
- 1.12%
Concepts tested
- reflected and refracted rays at polarising angle
All Questions
2022 1 question
-
A light ray falls on a glass surface of refractive index $\sqrt{3}$, at an angle $60^\circ$. The angle between the refracted and reflected rays would be :By Snell's law: $1 \times \sin 60^\circ = \sqrt{3}\sin r \Rightarrow \frac{\sqrt{3}}{2} = \sqrt{3}\sin r \Rightarrow \sin r = \frac{1}{2}$, so $r = 30^\circ$ Angle of reflection = $60^\circ$, so the angle between the reflected and refracted rays $= 180^\circ - 60^\circ - 30^\circ = 90^\circ$ (Alternatively, $\tan i_p = \mu = \sqrt{3} \Rightarrow i_p = 60^\circ$; the ray is incident at Brewster's angle, so the reflected and refracted rays are perpendicular.)