In a double-slit experiment using sodium light of wavelength 5890 , an interference pattern is obtained in
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In a double-slit experiment using sodium light of wavelength 5890 Å, an interference pattern is obtained in which 20 equally spaced fringes occupied a distance of 2.0 cm on a screen. On replacing the sodium lamp with another monochromatic source but making no other changes, 30 fringes are found to occupy a distance of 2.4 cm on the screen. What is the wavelength of light from the source?
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