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14 April, 03:00

Suppose I create a two-slit interference pattern using light with some wavelength lambda and slits with some separation D. If I were to increase lambda, what would happen to the interference pattern on the wall? The pattern would spread out Nothing would happen to the pattern The pattern would compress

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  1. 14 April, 05:00
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    The pattern would spread out.

    Explanation:

    The fringe width is given by the relation

    fringe width = λ L / D where λ is wavelength of light used, L is distance of wall from the source of light and D is slit separation.

    If we increase λ, fringe width will increase and therefore pattern will spread out.
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