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Old Nov 5th 2008, 06:41 PM   #1
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Join Date: Sep 2008
Posts: 12
Diffraction Grating (HELP PLEASE)

Monochromatic light with a frequency of 5.50 x 10^14 Hz is directed onto a diffraction grating ruled with 6000 lines/m. What is the distance between the third bright line and the fifth dark line of the interference pattern formed on a screen 2.50m from the grating?
wave length = dx/nL

wave length = 5.454545454545455e-7
d = 1/6000 = 1.666666667e-4
x = ?
n = ?
L = 2.50m

Answer: 0.0123m
Need help and explanation on how to find the "order of fringe" (n) and "distance from central bright fringe to nth fringe" (x).
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