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A lab technician uses laser light with a wavelength of 630 nm to test a diffraction...

A lab technician uses laser light with a wavelength of 630 nm to test a diffraction grating.

When the grating is 41.7 cm from the screen, the first-order maxima appear 6.02 cm from the center of the pattern.

How many lines per millimeter does this grating have?

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