NEET UG 2020 · Physics · Question 165
NEET 2020 Physics, question 165
Question 165 of the NEET 2020 paper (code E1) is a Physics question from Wave Optics. Its idea, Proportionality of Fringe Width to D and d, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 3.
Updated 2026-10-08
Q165 · Physics
In Young's double slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes :
- 1double
- 2half
- 3four timesOfficial answer
- 4one-fourth
Official answer: option 3 · NTA final answer key
Same idea
The only question on Proportionality of Fringe Width to D and d
No other NEET paper from 2017–2026 tested this exact idea.
Proportionality of Fringe Width to D and d: 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. Young's Double Slit alone had 7.