Double slit experiment intensity distribution

[richyw]

Homework Statement

I need to derive the intensity distribution of the double slit experiment. Intensity as a function of the slit separation d, the distance to the screen L and the wavelength $\lambda$. L>>d

Homework Equations

The Attempt at a Solution

Ok this is ridiculous but everything I find is just telling me how to find the minimum or maximum. I also need to figure this out for the triple and N slit problems.

I know that intensity is basically the square of the electric field. So I have been trying to make two waves and then add them together and then square them. I keep going wrong here. Is there an online resource that takes this approach?

 

[DrClaude]

Have a look at http://web.mit.edu/viz/EM/visualizations/coursenotes/modules/guide14.pdf

 

[mfb]

I know that intensity is basically the square of the electric field. So I have been trying to make two waves and then add them together and then square them. I keep going wrong here.

Please show your work then, so we can see what you did and what went wrong. The basic idea is right.