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A monochromatic beam of wavelength ? = 640 nm illuminates a double-slit. The separation between the...

  1. A monochromatic beam of wavelength ? = 640 nm illuminates a double-slit. The separation between the two slits equals ? = 0.024 mm and the width of each slit is equal to ? = 0.004 mm. (a) How many complete fringes appear between the first minima of the diffraction envelope to either side of the central maximum? (b) What is the ratio of the intensity of the third and seventh fringes to that of the central fringe? (c) What is the total number of observable fringes in such a pattern? Are there any missing fringes? At what angles do they occur?

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