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a mixed spectra containing red (650 nm) and blue (405 nm) light shines on a diffraction...

a mixed spectra containing red (650 nm) and blue (405 nm) light shines on a diffraction that has 7000 lines per cm on a screen that is 1.5 m away. How far apart is the 1st order red and blue lines? (find the angles and then use trig to help you get y values for each color line)

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