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A diffraction grating gives a second-order maximum at as angle of 31‹ for violet light (ƒÉ = 4.0 ~ 102 nm). If the diffraction grating is 1.0 cm in width, how many lines are on this diffraction grating?

  • physics -

    Sorry about the double post, and
    the question is:
    A diffraction grating gives a second-order maximum at as angle of 31 degrees for violet light (wavelength = 4.0 x 102 nm). If the diffraction grating is 1.0 cm in width, how many lines are on this diffraction grating?

  • physics -

    n lambda = d sin( theta )

    d=n * lambda/sinTheta

    solve for d. That is the distance between slits, so lines/distance= 1/d

    change wavelength to cm if you want lines per cm

  • physics -

    isn't that derived from the formula used for single slit though? and this is multiple slit (isn't that the same eqns as double slit?

  • physics -

    so n= 2 (second order)
    theta= 31 degrees
    d= 0.1 m
    lambda= 4.0 x 10^-7 m

    (i'm required to solve in m)

    is this correct?

  • physics -

    no

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