Question

When a light ray incidents on the surface of a medium, the reflected ray is completely polarized. Then the angle between reflected and refracted rays is:

• A. 45°
• B. 90°
• C. 120°
• D. 180°

Hint:

Brewster’s angle is given by \( \tan \theta_B = \frac{n_2}{n_1} \), where \( n_1 \) and \( n_2 \) are refractive indices of the media.

Answer 1

The Correct Option is B

Step 1: {Understanding Brewster's Law} 
According to Brewster's law, when light is incident at the Brewster angle, the reflected light is completely polarized.
At this angle, the reflected and refracted rays are perpendicular to each other. 
Step 2: {Derivation of the Perpendicular Relation} 
\[ \theta_{{reflected}} + \theta_{{refracted}} = 90^\circ \] Thus, the angle between the reflected and refracted rays is: \[ \theta = 90^\circ \] Thus, the correct answer is \( 90^\circ \).