PHYSICS
posted by Ashley .
Two parallel slits are illuminated by light composed of two wavelengths. One wavelength is λA = 553nm. The other wavelength is λB and is unknown. On a viewing screen, the light with wavelength λA = 553nm produces its thirdorder bright fringe at the same place where the light with wavelength λB produces its fourth dark fringe. The fringes are counted relative to the central or zerothorder bright fringe. What is the unknown wavelength?
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