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M1-21: LASER DIFFRACTION - MULTIPLE SLITS 7 years 10 months ago #962

  • zzfixk21
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ID Code: M1-21
Purpose: Show the transition from one slit to multiple slits and the diffraction grating.
Description: A slide contains an array of 1, 2, 3, 4, and 5 slits. The single and double slit patterns are familiar. For N slits, where N is 3 or more, N-2 maxima of lesser intensity appear between the primary maxima. As N increases, the primary maxima increase in intensity as the 1st, 2nd, 3rd, 4th,etc. order spots, and these lesser maxima decrease in intensity until they cease to exist for a grating.

The picture below is for a three slits, so it shows one minor peak between each pair of major peaks.

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