(adsbygoogle = window.adsbygoogle || []).push({}); 1. Light of wavelength 632.8nm is normally incident upon a grating of 5000 lines/cm. How many different diffraction orders can be seen in transmission?

2. m(lambda)=d(sintheta)

3. According to my text, d=1/5000lines/cm = 2x10^-6m

and sintheta= lambda/d = 632.8x10^-9/ 2x10^6 = .3164

If I take sin^-1(.3164), I get 18 degrees.

From here, I don't know what to do because the answer is that 7 beams exist, corresponding to 4 orders, and I don't know how to get to that answer!

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# Diffraction orders seen

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