Monday, July 25, 2011

Interference and Diffraction

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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