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The fraunhofer diffraction pattern of a single slit is formed at the focal plane of a lens of focal length f. The distance between 1st and 2nd maxima on screen is y and a is slit width. Then the wave length of light used is

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The fraunhofer diffraction pattern of a single slit is formed at the focal plane of a lens of focal length f. The distance between 1st and 2nd maxima on screen is y and a is slit width. Then the wave length of light used is



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