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!

Expert's answer

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.

dsinθ=mλ ->

m=d sin θ/λ=|sin θ=1|=(3.3*10

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