Answer to Question #3116 in Optics for Viviana

Question #3116
Light of wavelength 450 nm is incident normally on a diffraction grating with 300 lines per millimeter. How many orders of diffraction maxima can be obtained? =) A. 7 B. 8 C.14 D.15 Thanks!
1
Expert's answer
2011-06-14T10:11:07-0400
D=300 lines per millimeter -> d=1/D=1/300=3.3*10^(-6) millimeter.
dsinθ=mλ ->
m=d sin θ/λ=|sin θ=1|=(3.3*10-6)/(0.45*10-6)=7,33 ≈ 7 maxima.

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