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the distance between the coherent source is 0.3 mm and the screen is 90 cm from the sourcees.the second dark band is 0.3 cm from the central bright fringe.find the wavelength and distance of fourth bright fring from central bright fringe

the distance between the coherent source is 0.3 mm and the screen is 90 cm from the sourcees.the second dark band is 0.3 cm from the central bright fringe.find the wavelength and distance of fourth bright fring from central bright fringe 

Grade:12

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