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Two parallel slits are illuminated by light composed of two wavelengths. One wavelength is λA =...

Question:

Two parallel slits are illuminated by light composed of two wavelengths. One wavelength is λA = 657 nm. The other wavelength is λB and is unknown. On a viewing screen, the light with wavelength λA = 657 nm produces its fifth-order bright fringe at the same place where the light with wavelength λB produces its sixth dark fringe. The fringes are counted relative to the central or zeroth-order bright fringe. What is the unknown wavelength in nm?


Answers

Given are La-657nm Lb produces 6th dark fringe Lb=? ifth-ordec bright fringe using below formula y-mLR d(bright fringe) for f

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