1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Range of wavelength from white light through a diffraction grating

  1. Mar 24, 2010 #1
    1. The problem statement, all variables and given/known data

    A narrow beam of collimated white light falls at normal incidence upon a transmission grating with 3150 lines per cm. A spectrum is formed by the grating on a screen 30 cm away. If a 1 cm square hole is cut in the screen its inner edge being 5 cm from the zeroth order, what range of visible wavelengths passes through the hole?

    2. Relevant equations

    N[tex]\lambda[/tex] = dsin[tex]\theta[/tex]

    3. The attempt at a solution

    [tex]\frac{\Delta\lambda}{\theta\Delta}[/tex] = [tex]\frac{d}{N}[/tex][tex]\sqrt{1 - sin^2\theta}[/tex]
  2. jcsd
  3. Mar 25, 2010 #2


    User Avatar
    Homework Helper

    What is the range of angle determined by the square hole ?

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook