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# of diffraction orders seen?

  • Thread starter BuBbLeS01
  • Start date
602
0
# of diffraction orders seen???

1. Homework Statement
A 513 line/mm diffraction grating is illuminated by light of wavelength 567 nm. How many diffraction orders are seen?


2. Homework Equations



3. The Attempt at a Solution
d*sin theta = mt
t = wavelength

m = d*sin theta/t
I don't have the angle so I just omitted it assuming it would be very small and I did...
m = d/t = 3.4 so 3 diffraction orders

Is this correct?
 

Answers and Replies

602
0
Does anyone know how to do this?
 
458
0
The value of sin has to be at a maximum (ie. 1), so the angle is 90 degrees. What you did looks right. If the angle was very small, then m would also be very small.
 
602
0
Thank you so much! I have a test on Thursday and I am having a hard time understanding light!!
 

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