5.  In a Young’s double-slit experiment, the seventh dark fringe is located 0.025 m to the side of the central bright fringe on a flat screen, which is 1.1 m away from the slits. The separation between the slits is 1.4 x 10-4 m. What is the wavelength of the light being used?

 

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

 

Solve for λ

We get q, by first using tangent

 

 

 

Now we can find λ

 

 

 

 

Please send any comments or questions about this page to ddonovan@nmu.edu

This page last updated on July 7, 2018