Easy question on diffraction of light

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The discussion revolves around calculating the number of observable diffraction orders for two wavelengths of light (520nm and 520.8nm) using a diffraction grating with 400 lines per mm. The calculation involves determining the grating spacing (d) and applying the diffraction equation N = dsinθ/λ. The user finds that for the first wavelength (520nm), the calculated value is approximately 4.8, suggesting that 4 orders can be seen. Another participant confirms the math is correct, reinforcing confidence in the solution. The thread concludes with a hopeful affirmation of the answer's accuracy.
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[SOLVED] Easy question on diffraction of light please help!

Homework Statement


Wavelengths are; 1 - 520nm
Wavelength 2 - 520.8nm
Diffraction grating - 400 lines per mm
How many orders will the lines be seen in?


Homework Equations


N = dsin0/lamda


The Attempt at a Solution



d = 1/4 X 10^5 = 25 X10^-7m
25 X 10^-7 / 520 X 10^-9 = 4.8
So is the answer 4? for the first wavelength (520nm)
 
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Your work looks good to me.
 
I got 4.80769, so your math is correct.
 
Thanks - hope its right!
 

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