JEE Main 2020 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 2 September 2020, Shift 2, Physics Q16

Question 16 of 75 in this shift, Physics question 16 of 25.

In a Young’s double slit experiment, 16 fringes are observed in a certain segment of the screen when light of wavelength 700 nm is used. If the wavelength of light is changed to 400 nm, the number of fringes observed in the same segment of the screen would be :

(1)18
(2)24
(3)28Official answer
(4)30

Official answer

Option 3

NTA final key (Sep 2020).

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.