2. In a Young’s double-slit experiment, the angle that locates the second dark fringe on either side of the central bright fringe is 5.4°. Find the ratio d/λ of the slit separation d to the wavelength λ of the light.

 

Dark Fringes in a double-slit experiment have the defining equation

 

Solve for the ratio

 

Note, first dark fringe is m=0, so second is m=1

 

 

 

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This page last updated on July 7, 2018