Question

a parallel beam of monochromatic light falls normally on a single slit. how does the angular width of principal maximum in the diffraction pattern depend on the width of slit.

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Answer 1

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A parallel beam of monochromatic light falls normally on a narrow slit of width'a' to produce a diffraction pattern on the screen placed parallel to the plane of the slit. Use Huygens principle to explain that (i) the central bright maxima is twice as wide as the other maxima. (ii) the intensity falls as we move to successive maxima away from the centre on either side.

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