Illuminated with light composed of two wavelengths

Reference no: EM13667690

Two parallel slits are illuminated with light composed of two wavelengths, one of which is 645 nm. On a viewing screen, the light whose wavelength is known produces its third dark fringe at the same place where the light whose wavelength is unknown produces its fourth-order bright fringe. The fringes are counted relative to the central or zeroth-order bright fringe. What is the unknown wavelength?

Reference no: EM13667690

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