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12 March, 06:58

In a young's double-slit experiment, the angle that locates the second dark fringe on either side of the central bright fringe is 6.5 degrees. find the ratio d/λ of the slit separation d to the wavelength λ of the light.

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  1. 12 March, 06:59
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    (d/λ) = 17.67

    Explanation:

    Equation for double-slit:

    d*sinθ = m*λ

    Rearrange the equation

    (d/λ) = m / (sinθ)

    Since it is at the second dark fringe, m = 2

    Therefore:

    (d/λ) = 2 / (sin (6.5)

    (d/λ) = 17.67
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