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In an experiment using sodium light of wavelength 5890 Å, an interference pattern was obtained in which 20 equally spaced fringes occupied 2.30 cm on the screen. On replacing sodium lamp with another monochromatic source of a different wavelength with no other changes, 30 fringes were found to occupy 2.80 cm on the screen. Calculate the wavelength of light from this source

In an experiment using sodium light of wavelength 5890 Å, an interference pattern was obtained in which 20 equally spaced fringes occupied 2.30 cm on the screen. On replacing sodium lamp with another monochromatic source of a different wavelength with no other changes, 30 fringes were found to occupy 2.80 cm on the screen. Calculate the wavelength of light from this source
 

Grade:12th pass

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