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NEET-UG and JEE Main Physics · Class 12

Interference and Young's double-slit experiment — NEET & JEE Questions

Interference and Young's double-slit experiment is a topic in Optics, a Class 12 Physics chapter of the NEET-UG and JEE Main syllabus. TestBudy holds 14 published NEET-UG and JEE Main questions on Interference and Young's double-slit experiment, each with the marking scheme of the real paper.

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Interference and Young's double-slit experiment MCQs with solutions

10 of the 14 published questions on this topic, exactly as they appear in a test. Answers and worked solutions come with your result rather than on this page.

  1. Question 1 · difficulty L1 · recall

    Interference results from

    • A. superposition of coherent waves
    • B. absorption of one wave by another
    • C. reflection from only one surface
    • D. random addition with no phase relation

  2. Question 2 · difficulty L1 · understanding

    For constructive interference, path difference is

    • A. (m+1/2)λ
    • B. mλ
    • C. λ/4 only
    • D. always zero and no other value

  3. Question 3 · difficulty L2 · understanding

    For destructive interference, path difference is

    • A. mλ
    • B. 2mλ only
    • C. (m+1/2)λ
    • D. λ²/d

  4. Question 4 · difficulty L2 · application

    In Young's double-slit experiment, fringe width is

    • A. β=dD/λ
    • B. β=λd/D
    • C. β=D/(λd)
    • D. β=λD/d

  5. Question 5 · difficulty L2 · understanding

    In Young's double-slit experiment, sustained interference fringes require the two sources to be

    • A. coherent
    • B. independent with rapidly changing phase difference
    • C. of completely unrelated frequencies
    • D. incoherent sunlight patches only

  6. Question 6 · difficulty L3 · application

    If wavelength is doubled in YDSE with D and d fixed, fringe width

    • A. doubles
    • B. halves
    • C. quadruples
    • D. stays unchanged

  7. Question 7 · difficulty L3 · application

    If slit separation d is doubled in YDSE, fringe width

    • A. doubles
    • B. halves
    • C. quadruples
    • D. stays unchanged

  8. Question 8 · difficulty L3 · application

    In Young's double-slit experiment, fringe width is given approximately by

    • A. β=λD/d\beta=\lambda D/d
    • B. β=dD/λ\beta=dD/\lambda
    • C. β=λd/D\beta=\lambda d/D
    • D. β=D/(λd)\beta=D/(\lambda d)

  9. Question 9 · difficulty L3 · application

    If the wavelength in a Young's double-slit experiment is doubled while slit separation and screen distance remain unchanged, the fringe width

    • A. doubles
    • B. halves
    • C. remains unchanged
    • D. becomes one-fourth

  10. Question 10 · difficulty L4 · analysis

    At the central point equidistant from two coherent in-phase slits, the interference is

    • A. destructive
    • B. random
    • C. constructive
    • D. necessarily zero intensity

Common mistakes in Interference and Young's double-slit experiment

Recorded against questions in this topic that are not shown above, so none of these points at an answer you can see on this page.

  • Mixes millimetres, metres and nanometres without converting units consistently.

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