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JEE Main 2024 · PhysicsNumerical answerNumerical valueMediumMulti-step

JEE Main 29 January 2024, Shift 1, Physics Q59

Question 59 of 90 in this shift, Physics question 29 of 30, Section B.

In a double slit experiment shown in figure, when light of wavelength 400 nm is used, dark fringe is observed at PP. If D=0.2 m, the minimum distance between the slits S1S_1 and S2S_2 is ______ mm.

The figure, in words

Figure: a source on the left on a horizontal dashed line; a vertical line (screen with slits) at distance D from the source, with S1 above and S2 lower on that vertical line, separated by d (labelled d between S1 and S2 along the vertical); point P on the horizontal line at distance D to the right of the vertical line; dashed rays from the source to S1 and from S1 to P.

Official answer

0

NTA final key.

Chapter
Wave Optics
Topic
Young's Double Slit
Idea tested
Exact Path Difference without Approximation

Same topic in other shifts

All Young's Double Slit questions
  1. 2 Apr 2026, Shift 2 · Q46In a Young's double slit experiment, the intensity at some point on the screen is found to be 34\frac{3}{4} times of the maximum of the…MediumNumerical value
  2. 4 Apr 2026, Shift 2 · Q50In a double slit experiment, when one of the slits is covered by a transparent mica sheet of refractive index 1.56, the central fringe…MediumNumerical value
  3. 5 Apr 2026, Shift 1 · Q39In Young's double slit experiment, the fringe width of the interference pattern produced on the screen is 2.4 μ2.4\ \mum. If the experiment…EasySingle correct
  4. 5 Apr 2026, Shift 2 · Q42The maximum intensity in a Young's double slit experiment is I0I_0. Distance between the slits (dd) is 5λ5\lambda, where λ\lambda is the…MediumSingle correct
  5. 6 Apr 2026, Shift 1 · Q36In interference experiment the path difference between two interfering waves at a point AA on the screen is λ/3\lambda/3, where λ\lambda…EasySingle correct
  6. 6 Apr 2026, Shift 2 · Q45In a Young double slit experiment, the wavelength of incident light is 6000 Å, the separation between slits S1S_1 and S2S_2 is 5 cm and…MediumDiagram basedHas a figure

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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.