http://www.falstad.com/ripple/index.html
This is the "ripple tank" applet I showed in class. Play around with 2-source interference and note locations of constructive and destructive interference. This also happens with light waves.
The mathematical relationship:
n lambda = d sin(theta)
n is the "image order number," going from 0 (central image, directly in line with the light source) to n=1 (first order image, the same on either side of the central image), to n=2, etc.
lambda is the wavelength of light
d is the distance of separation between "slits"
theta is the angle of diffraction
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