The two most prominent wavelengths in the light emitted by a helium discharge lamp are 686.7 nm (red) and 587.6 nm (yellow). Light from a helium lamp illuminates a diffraction grating with 750 lines/mm, and the light is observed on a screen 50 cm behind the grating. What is the distance between the first-order red and yellow fringes? Express your answer in cm.
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