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Unformatted text preview: ouble Slit • The total phase diﬀerence between two waves from a coherent source, with wavelength λ, depends upon 2 factors. • The distance the wave has traveled, Δx. • In this experiment coherent light is sent through 2 small narrowly spaced slits. • Each slit then acts as a new emi\er of light. (Huygen’s Principle) • The light from each slit is originally in phase . • The path diﬀerences from the two slits to a distant screen creates a phase diﬀerence between the two wavefronts and produces an interference pa3ern. – Total phase change from this is ΔΦ = (2π/λ)•Δx • The ini2al phase of the emi\ed wave. – Note: This is where the phase change on reﬂec2on is accounted for. Double Slit Interference Pa\ern Equa2ons for Maxima and Minima For maxima d sin (! ) = m" for m = 0, ± 1, ± 2, ± 3, ...
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d sin (! ) = $ m + ' ( for m = 0, ± 1, ± 2, ± 3, ...
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2& For minima 4 7/13/11 Gra2ngs Single Slit Diﬀrac2on • A single slit will produce an interference pa\ern as well. • We can emp...
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 Summer '11
 Bratton
 Diffraction

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