NEET UG 2018 · Physics · Question 8
NEET 2018 Physics, question 8
Question 8 of the NEET 2018 paper (code AA) is a Physics question from Wave Optics. Its idea, Polarisation and Malus's Law, was asked 6 times, in 2017, 2018, 2020, 2024 and 2025, across NEET 2017–2026. The CBSE official answer key gives option 2.
Updated 2026-10-08
Q8 · Physics
Unpolarised light is incident from air on a plane surface of a material of refractive index ''. At a particular angle of incidence 'i', it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation ?
- 1
- 2Reflected light is polarised with its electric vector perpendicular to the plane of incidenceOfficial answer
- 3Reflected light is polarised with its electric vector parallel to the plane of incidence
- 4
Official answer: option 2 · CBSE official answer key
Same idea
Polarisation and Malus's Law, in other papers
NEET asked this idea 6 times, in 2017, 2018, 2020, 2024 and 2025. The other 5 questions below.
- 2025 Q27An unpolarized light beam travelling in air is incident on a medium of refractive index 1.73 at Brewster's angle. Then-One-line MCQ · Easy
- 2025 Q43The intensity of transmitted light when a polaroid sheet, placed between two crossed polaroids at 22.5° from the polarization axis of one…Numerical · Medium
- 2024 Q2An unpolarised light beam strikes a glass surface at Brewster's angle. ThenOne-line MCQ · Easy
- 2020 Q138The Brewsters angle for an interface should be :One-line MCQ · Medium
- 2017 Q37Two Polaroids and are placed with their axis perpendicular to each other. Unpolarised light is incident on . A…Numerical · Easy
Polarisation and Malus's Law: every question and how it was framed
The chapter
Wave Optics in ten years of NEET
15 questions from 2017–2026, asked in 8 of 10 papers, about 1.5 a paper. Single Slit Diffraction alone had 8.