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September 3, 2015

Homework Help: Physic please help!

Posted by Mary on Wednesday, November 14, 2007 at 4:03pm.

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

___________ nm

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