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Homework Help: Help With Simple Single Slit Diffraction Pattern?

  1. Nov 8, 2012 #1
    1. The problem statement, all variables and given/known data
    Plane light waves are incident on a single slit of width 2.45 cm. The second dark fringe is observed at 44.3° from the central axis. What is the wavelength of the light?

    2. Relevant equations
    θ=pλ/a...... where theta is in radians, p =2 (second light minimum), and a = slit width

    this seems like it should be a simple problem but I can't get the answer..any Help?

    3. The attempt at a solution
    I tried

    44.3°=.7732 rad so .7732=(2)(λ)/.0245 and solved for λ. Also, does come out in nano meters or meters?

    Thanks for your help!
  2. jcsd
  3. Nov 9, 2012 #2


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    Homework Helper

    That is a very wide slit if you are expecting to notice diffraction of light.!!
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