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Old Aug 8th 2011, 01:30 AM   #1
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Slit problem

A double slit arrangement is illuminated by light that consists of two wavelengths, one of which is known to be 500nm. The interference pattern on a screen shows that the third dark fringe for the known wavelength coincides with the fourth bright fringe for the known wavelength. What is the unknown wavelength?
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Old Dec 7th 2014, 11:15 AM   #2
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Answer

(500 nm x 3,5) / 4 = 437,5 nm
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