A)a beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes in a youngs double-slit experiment. B)find the distance of the third bright fringe on the screen from the central maximum for wavelength 650 nm. C)what is the least distance from the central maximum where the bright fringes due to both the wavelengths coincide? The distance between the screen and slit is 2m and distance between the slit is 1mm.
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2600 d n/m
this is the least distance
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