The central bright fringe broadens to a width of 2.1 cm., Ask an Expert

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In a single-slit diffraction pattern on a flat screen, the central bright fringe is 1.4 cm wide when the slit width is 2.7 x 10-5 m. When the slit is replaced by a second slit, the wavelength of the light and the distance to the screen remaining unchanged, the central bright fringe broadens to a width of 2.1 cm. What is the width of the second slit? It may be assumed that is so small that sin is approximately equal to tan.

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