Evaluate the unknown wavelength

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Reference no: EM13667058

Two parallel slits are illuminated by light composed of two wavelengths, one of which is 645 nanometer. On a viewing screen, the light whose wavelength is known produces its second dark fringe at the similar place where the light whose wavelength is unknown produces its ninth-order bright fringe. The fringes are counted relative to the central or zeroth-order bright fringe. Evaluate what is the unknown wavelength?

Reference no: EM13667058

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