JEE Main 2021 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 26 February 2021, Shift 1, Physics Q17

Question 17 of 90 in this shift, Physics question 17 of 30, Section A.

In a Young’s double slit experiment two slits are separated by 2 mm and the screen is placed one meter away. When a light of wavelength 500 nm is used, the fringe separation will be :

(1)1 mm
(2)0.75 mm
(3)0.50 mm
(4)0.25 mmOfficial answer

Official answer

Option 4

NTA final key.

Chapter: Wave Optics
Topic: Young's Double Slit
Idea tested: YDSE Fringe Width

Same idea in other shifts

Asked 14× in all

5 Apr 2024, Shift 1 · Q58In Young's double slit experiment, carried out with light of wavelength 5000 Å, the distance between the slits is 0.3 mm and the screen is…EasyNumerical value
8 Apr 2023, Shift 2 · Q46The width of fringe is 2 mm on the screen in a double slits experiment for the light of wavelength of 400 nm. The width of the fringe for…EasySingle correct
28 Jul 2022, Shift 1 · Q53In a Young's double slit experiment, a laser light of 560 nm produces an interference pattern with consecutive bright fringes' separation…EasyNumerical value
29 Jun 2022, Shift 1 · Q49Using Young's double slit experiment, a monochromatic light of wavelength 5000 $\mathrm{\AA}$ produces fringes of fringe width 0.5 mm. If…EasySingle correct
29 Jun 2022, Shift 2 · Q59In a double slit experiment with monochromatic light, fringes are obtained on a screen placed at some distance from the plane of slits. If…MediumNumerical value
3 Aug 2021, Shift 2 · Q27In Young's double slit experiment, 58 fringes are observed in the field of view when a light of wavelength 6000 $\mathrm{\AA}$ was used.…EasyNumerical value
26 Aug 2021, Shift 1 · Q27White light is passed through a double slit and interference is observed on a screen 1.5 m away. The separation between the slits is 0.3…MediumNumerical value
31 Aug 2021, Shift 2 · Q24In a Young's double slit experiment, the slits are separated by 0.3 mm and the screen is 1.5 m away from the plane of slits. Distance…EasyNumerical value

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.