For a bright fringe, For a dark fringe, m: any integer
For two beams of equal irradiance (I 0 )
Visibility of the fringes (V) Maximum and adjacent minimum of the fringe system
Thomas Young's Double Slit Experiment
Photograph of real fringe pattern for Young’s double slit
The two waves travel the same distance –Therefore, they arrive in phase S S'S'
The upper wave travels one wavelength farther –Therefore, the waves arrive in phase S S'S'
The upper wave travels one-half of a wavelength farther than the lower wave. This is destructive interference S S'S'
Young’s Double Slit Experiment provides a method for measuring wavelength of the light This experiment gave the wave model of light a great deal of credibility. Uses for Young’s Double Slit Experiment