Michelson Interferometer Fringe pattern

Michelson Interferometer is usually used to measure the wavelength of light put through it.
1) This program performs Michelson Interferometer Fringe pattern.
2) The screen detector intensity interference pattern formula was referred from: http://www.physics.usyd.edu.au/teach_res/mp/doc/op_michelson.htm
3) According to the document mentioned in the above link, the program shows the interference pattern of the waves received by the screen detector.
4) Also we can observe that as the angle theta is changed, we get different patterns.