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A monochromatic light of wavelength lamb...

A monochromatic light of wavelength `lambda` is incident normally on a narrow slit of width `a` to produce a diffraction pattern on the screen placed at a distacne `D` from the slit. With the help of a relevant diagram, deduce the condition for maxima and minima on the screen. use these condition to show that angular width of central maximum is twice the angular width of secondary maximum.

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