What is the Brewster angle (polarizing angle) for light incident from air into glass with refractive index n = 1.732 (approx. sqrt(3))?
Answer and explanation
Correct answer: D. 60 degrees
- Step 1: Brewster's law: tan(theta_B) = n2 / n1. Step 2. tan(theta_B) = 1.732 / 1.0 = sqrt(3). Step 3. theta_B = arctan(sqrt(3)) = 60 degrees. Answer: 60 degrees. Why not the others: 30 degrees has tan(30°) = 1/sqrt(3) = 0.577; 45 degrees has tan(45°) = 1.0.
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