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(C) When a narrow slit is illuminated by a parallel beam of monochromatic light,the light undergoes diffraction.According to the theory of single-slit

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$A$ bright central fringe bordered on both sides with fringes of rapidly decreasing intensity will be observed.

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(C) When a narrow slit is illuminated by a parallel beam of monochromatic light,the light undergoes diffraction.According to the theory of single-slit diffraction,the intensity distribution on the screen consists of a central maximum (bright fringe) which is the brightest.On either side of this central maximum,there are secondary maxima and minima.The intensity of these secondary maxima decreases rapidly as we move away from the center.Therefore,a bright central fringe bordered on both sides by fringes of rapidly decreasing intensity is observed.

$A$ screen is placed at a certain distance from a narrow slit,which is illuminated by a parallel beam of monochromatic light. What will you observe if you scan the screen with the help of a microscope?

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