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Helium atoms emit light at several wavelengths. Light from a helium lamp illuminates a diffraction grating...

Helium atoms emit light at several wavelengths. Light from a helium lamp illuminates a diffraction grating and is observed on a screen 50.00 cm behind the grating. The emission at wavelength 501.5 nm creates a first-order bright fringe 21.90 cm from the central maximum. What is the wavelength of the bright fringe that is 26.63 cm from the central maximum?

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