Light waves with two different wavelengths 632nm and 474nm, Ask an Expert

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Light waves with two different wavelengths, 632nm and 474nm, pass simultaneously during a single slit whose width is 7.5 x10^-5m and strike a screen 1.20 m from the slit. Two diffraction patterns are formed on the screen. What is the distance (in cm) between the common center of the diffraction patterns and the first occurrence of a dark fringe from one pattern falling on top of a dark fringe from the other pattern?

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