# 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!

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

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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