A helium-neon laser icircraquo 6328 nm is used to, Ask an Expert

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A helium-neon laser (Î» = 632.8 nm) is used to calibrate a diffraction grating. If the first-order maximum occurs at 20.0 °, what is the spacing between adjacent grooves in the grating? (In this problem, assume that the light is incident normally on the grating.)

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