Number of diffracted orders produced

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SUMMARY

The discussion focuses on calculating the angle of diffraction and the number of diffracted orders produced by a laser beam with a wavelength of 630 nm directed at a diffraction grating with 300 lines per millimeter. The user correctly applies the formula d sin(theta) = n x wavelength to find the angle of diffraction for the first two orders, resulting in an angle of 22.2 degrees for n=2. However, the user miscalculates the number of diffracted orders, suggesting that n=5.29, which does not align with the expected results from standard diffraction theory.

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Homework Statement


Hi
A liitle help will be appreciated. The question is as follows:
A laser beam of wavelength 630nm is directed normally at a diffraction grating with 300 lines per millimetre. Calculate:
a) The angle of diffraction of each of the first 2 orders
b) The number of diffracted orders produced



Homework Equations



I used the formula

d X sintheta = n x wavelength





The Attempt at a Solution


N= 300000
therefore d= 1/300000

n=2
Wavelength = 630nm

Putting the above value in I obtained 22 .2 degrees

b) For the second part, I surmised that theta = 90 degrees
Therefore,
n = d/wavelength

I obtained 5. 29. But this diifers from the books answer.

Please help!
 
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I've replied to this on TSR.
 
lol! Apologies again. You could probably guess I post on a few forums. Please keep on tracking me. Its highly appreciated.
 

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