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July 31, 2015

Homework Help: Physics

Posted by EM on Sunday, March 7, 2010 at 6:14pm.

Light from a sodium lamp ( wavelength= 589 nm) illuminates a narrow slit and is observed on a screen 75 cm behind the slit. The dstance between the first and third dark fringes is 7.5 mm. What is the width (in mm) of the slit?

Cant seem to get the answer =/

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