Physics, 03.08.2019 00:10, chasechevy13

Interactive learningware 27.1 provides some pertinent background information for this problem. two parallel slits are illuminated by light composed of two wavelengths. one wavelength is λa = 627nm. the other wavelength is λb and is unknown. on a viewing screen, the light with wavelength λa = 627nm produces its third-order 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 zeroth-order bright fringe. what is the unknown wavelength?

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Interactive learningware 27.1 provides some pertinent background information for this problem. two p...