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}
Brewster's law states that incident light at the Brewster angle results in completely polarized reflected light.
At this angle, the reflected and refracted rays are mutually perpendicular. 
Step 2: {Derivation of the Perpendicular Relation} 
\[ \theta_{{reflected}} + \theta_{{refracted}} = 90^\circ \] Therefore, the angle between the reflected and refracted rays is: \[ \theta = 90^\circ \] The correct answer is therefore \( 90^\circ \).