physics

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orange light (lambda=630nm) hits diffraction grating which has a line spacing of (mu)m. The interference pattern is seen on a screen that is 4.0m away.
what is the distance between the central bright spot and the first order bright spot on the screen.
(sorry I don't have symbols on my computer)
thank you!

  • physics -

    λ= 630•10⁻⁹ m,
    d= ? μm = ? •10⁻⁶ m
    L=4 m
    k=1
    x=?

    d•sin φ =k•λ
    sin φ=k•λ/d
    φ=sin⁻¹(k•λ/d)
    tan φ= x/L
    x=L•tan φ

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