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6 February, 14:45

A double slit is illuminated with monochromatic light of wavelength 6.11 * 102 nm. The m = 0 and m = 1 bright fringes are separated by 1.8 cm on a screen which is located 3.5 m from the slits. What is the separation between the slits?

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  1. 6 February, 15:08
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    The position of a maximum given by interference created by a double slit is given by the formula:

    d·sinα = m·λ

    First, you need to find the angle α: you know the separation of the first two maxima and the distance of the slit from the screen, therefore, using trigonometry after transforming the units of measurements, you get:

    y = 0.018 m

    D = 3.5 m

    α = tan⁻¹ (0.018/3.5) = 0.2945°

    Now, solve for d in the first equation (λ = 6.11*10⁻⁷ m):

    d = m·λ / sinα

    = 1 · 6.11*10⁻⁷ / sin 0.2945

    = 1.187 * 10⁻⁴ m

    Therefore, the separation between the slits is 1.2 * 10⁻⁴ m.
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