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woaini
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Homework Statement
A spectroscopist has a spectrometer equipped with a grating with 600 grooves/mm. This grating puts a 1228 nm wavelength range on a spectroscopic plate (a CCD) in order m = 5. The spectroscopist now changes the spectroscopic plate CCD by one that is larger by a factor of 3. What spectral range will be accepted when the spectroscopist observes the lines in order m = 4 with the new, larger spectroscopic plate?
λ1=1228
d= 1666.67
m1=5
m2=4
λ2=?
Homework Equations
mλ=dsinθ
The Attempt at a Solution
sinθ=[(5)(1228)]/(1666.67)=3.68
However I can't solve for θ, and plug it into another question for m2=4. What step should I do next?
So what exactly does the electroscopic plate do?
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