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Friday, 16 October

JEE Main 2025 · PhysicsMultiple choiceSingle correctMediumConceptual

JEE Main 8 April 2025, Shift 2, Physics Q42

Question 42 of 75 in this shift, Physics question 17 of 25, Section A.

In a Young's double slit experiment, the source is white light. One of the slits is covered by red filter and another by a green filter. In this case
  1. (1)there shall be alternate interference fringes of red and green.
  2. (2)there shall be an interference pattern for red distinct from that for green.
  3. (3)there shall be no interference fringes.Official answer
  4. (4)there shall be an interference pattern, where each fringe's pattern center is green and outer edges is red.

Official answer

Option 3

NTA final key.

Chapter
Wave Optics
Topic
Young's Double Slit
Idea tested
White Light Interference

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. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.