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The parallel grooves of information on the shiny side of a DVD or music CD reflect light just like a diffraction grating. Tipping a CD

The parallel grooves of information on the shiny side of a DVD or music CD reflect light just like a diffraction grating. Tipping a CD back and forth under white light, you observe one bright reflection of 391 nm violet light at 58 from normal incidence. The next adjacent bright violet reflection occurs at 33.5. Calculate the density of information grooves on the CD. Give your answer in units of grooves per mm.

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