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Physics, 22.08.2019 00:20 hokamidat

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 21.90cm from the central maximum. what is the wavelength of the bright fringe that is 31.60cm from the central maximum?

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