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Young’s Double Slit Experiment

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Young’s double slit © SPK

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Path difference:

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For a bright fringe, For a dark fringe, m: any integer

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For two beams of equal irradiance (I 0 )

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Visibility of the fringes (V) Maximum and adjacent minimum of the fringe system

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Thomas Young's Double Slit Experiment

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Photograph of real fringe pattern for Young’s double slit

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The two waves travel the same distance –Therefore, they arrive in phase S S'S'

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The upper wave travels one wavelength farther –Therefore, the waves arrive in phase S S'S'

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The upper wave travels one-half of a wavelength farther than the lower wave. This is destructive interference S S'S'

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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

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Fresnel double mirror P1 P2 © SPK

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Fresnel biprism © SPK

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Lloyd’s mirror © SPK

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Billet’s split lens © SPK

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For a bright fringe, For a dark fringe, Extra phase difference ± in Lloyd’s mirror

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Wavefront splitting interferometers Young’s double slit Fresnel double mirror Fresnel double prism Lloyd’s mirror

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1. Optics Author: Eugene Hecht Class no. 535 HEC/O Central library IIT KGP

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