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    Question

    In Young’s double-slit experiment, dark fringes on the

    screen occur where:
    A the waves from the two slits arrive in phase Correct Answer Incorrect Answer
    B the waves from the two slits arrive out of phase and interfere destructively Correct Answer Incorrect Answer
    C only one slit’s light reaches Correct Answer Incorrect Answer
    D the intensity of light is maximum Correct Answer Incorrect Answer

    Solution

    In Young’s double-slit experiment, dark fringes appear at points where the waves from the two slits arrive out of phase and interfere destructively . This happens when the path difference between the two waves is an odd multiple of λ/2, leading to cancellation of the light intensity at those points. Hence, destructive interference causes dark fringes.

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