9 - InterferenceDiffraction

Note this is where the phase change on reec2on is

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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, ... 1% " d sin (! ) = $ m + ' ( for m = 0, ± 1, ± 2, ± 3, ... # 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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