Home/
Competitive Exams/
JEE Main & Advanced/
Physics/
Electromagnetic Waves and Wave Optics/
Question 20221
JEE Physics · Easy

Electromagnetic Waves and Wave Optics: Polarisation by Reflection — Brewster's Law MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

Timer-based practiceDetailed answer reviewMobile-friendly flow
Polarisation by Reflection — Brewster's LawEasyQuestion 20221

Question

At Brewster's angle θ_B, reflected light is completely polarised. tan θ_B equals:
  1. A
    1/n
  2. B
    n (refractive index)
    Correct
  3. C
    n²
  4. D
    1/n²

Correct answer

n (refractive index)

Explanation

Brewster's law: tan θ_B = n. At this angle, the reflected and refracted rays are perpendicular. The reflected ray contains only the polarisation component perpendicular to the plane of incidence.

Review Electromagnetic Waves and Wave Optics notesStart timed chapter practice