Laser Lighting Light
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optics: What is the wavelength of the laser light?
A laser beam of unknown wavelength shines through the two slits and produces a diffraction pattern with dark bands at y1 = 10.2 mm, y2 = 30.5 mm, and y3 = 50.8 mm from the center of the central intensity maximum. If the distance between the slits d = 50 µm, and the distance between the slits and the screen is D = 144 cm, what is the wavelength of the laser light used?
to understand about lasers;
http://en.wikipedia.org/wiki/Laser
to solve the problem see sample / formulas;
http://www.eol.ucar.edu/apol/activity14.pdf
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