Register to reply 
Diffraction: how to know the amount of slits from a diffraction pattern? 
Share this thread: 
#1
May1210, 02:43 AM

P: 1

1. The problem statement, all variables and given/known data
There are at least two different situations. If you have N2 middle minimums, the amount of slits is N. Please, see the bottom left picture. The case with no such thing is the question about. How can I determine the amount of slits with the other cases? Please, see the other pictures in the link. 2. Relevant equations [tex]a sin(\theta) = n \lambda[/tex] where a is the width of the separtion of two sidebyside slits. Intensity formula with angle: [tex]I = I_{0} \left[ \frac{sin \left( \pi b sin \left( \frac{\theta}{\lambda} \right) \right) }{\pi b sin \left( \frac{\theta}{\lambda}} \right) \right]^{2} \left[\frac{sin\left(N \pi a sin\left(\frac{\theta}{\lambda}\right)\right)}{sin \left( \pi a sin\left( \frac{\theta}{\lambda}}\right) \right) \right]^{2}[/tex] 3. The attempt at a solution If you have 2 slits, then you have 5 main maximums. My proposal that the amount of maximums is 2N+1, where N is the amount of slits was rejected, by my teacher. You can see that it is not the case from the Wolfram link above. Then I tried to delve into the wave function but I am really lost with it. Cannot see how it helps in finding the the number of slits. 


Register to reply 
Related Discussions  
Spacing between slits in a diffraction grating w/o known wavelength  Introductory Physics Homework  1  
Diffraction pattern  Advanced Physics Homework  1  
Slits per cm on diffraction grating  Introductory Physics Homework  5  
Trig problems (Interference/diffraction and slits))  Introductory Physics Homework  3  
Multiple slits diffraction  Introductory Physics Homework  2 