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Homework Statement
For the diffraction grating that used to detect the wavelength of a wave, we use d sinθ= nλ.
When we find r1-r2 to get nλ.
1) What is the assumption we should make?
2)Then why r1-r2 will get λ?
Homework Equations
d sinθ= nλ
http://physicsed.buffalostate.edu/pubs/StudentIndepStudy/EURP09/Young/Young.html
The Attempt at a Solution
I think we should assume r1 = r2
I think from the second diagram , the first order formed due to the difference between the wavefront of 2 slits is one wavefront( same as one wavelength)?
Please guide . Thank you
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