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13.4 Double slit interference

13.4 Double slit interference. From one source and two gaps. 1 st bright fringe. central fringe. 1 st bright fringe. From one source and two gaps. 1 st bright fringe. central fringe. 1 st bright fringe. - the closer the slits become the wider the fringe separation.

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13.4 Double slit interference

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  1. 13.4 Double slit interference

  2. From one source and two gaps 1st bright fringe central fringe 1st bright fringe

  3. From one source and two gaps 1st bright fringe central fringe 1st bright fringe - the closer the slits become the wider the fringe separation. - waves of short wavelength give narrow fringe separation because blue light diffracts less.

  4. Path difference Phase difference

  5. Path difference Phase difference

  6. Double Slit interference - theory screen First bright fringe W Central fringe

  7. Double Slit interference - theory D screen First bright fringe W Ə Central fringe = wavelength = 600nm D = slit to screen distance = 2m S = slit separation = 0.5 mm W = fringe width = 1mm

  8. For constructive interference at the screen: ( ie a bright fringe ) Wave fronts from S1 and S2 must arrive at the screen in phase with a path difference of a whole number of wavelengths

  9. For constructive interference at the screen: ( ie a bright fringe ) Wave fronts from S1 and S2 must arrive at the screen in phase with a path difference of a whole number of wavelengths For destructive interference at the screen: ( ie a dark fringe ) Wave fronts from S1 and S2 must arrive out of phase with a path difference of half a wavelength

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