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Diffraction Grating - all visible light?

  1. Mar 26, 2017 #1
    1. The problem statement, all variables and given/known data
    Find the smallest grating spacing that lets you see the entire visible spectrum.
    400nm to 700nm comprises the visible light spectrum.
    no other information is given.

    2. Relevant equations
    nλ=d sin θ

    3. The attempt at a solution
    I am not sure how to start as all i have been given is a spectrum of wavelengths...?
     
  2. jcsd
  3. Mar 26, 2017 #2
    Well, apparently its 700nm. And 1400 nm for the second order.
     
  4. Mar 26, 2017 #3
    What is the maximum angle where a wavelength can be observed?
     
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