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Physics, 29.08.2019 16:10 triplej8100

Aspectrometer with grating size of 2 cm and a total of 10,000 lines is used to analyze the spectrum of a star. the light is normally incident on the grating and illuminates the whole grating. a sharp spectral line is observed in second order at an angle of 45o from normal incidence. what is the wavelength of this starlight?

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