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4 February, 19:26

Which is the destructive interference formula for diffraction grating problems?

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  1. 4 February, 23:15
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    The formula for the brighter patches resulting from constructive interference and darker patches resulting from destructive interference in a diffraction grating is:

    dsin (θ) = nλ

    Here, d is the spacing between the grating, θ is the angle of light, n is the fringe order and λ is the wavelength. N has integer values only.

    Destructive interference occurs between the fringes, so the formula for destructive interference becomes:

    dsin (θ) = (n+1/2) λ, where n is again an integer.
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