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Q8. Hi please help with each question in photo. Will give thumbs up thanks! A helium-neon laser (1 = 632.8 nm) is used to calibrate

Q8. Hi please help with each question in photo. Will give thumbs up thanks!

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A helium-neon laser (1 = 632.8 nm) is used to calibrate a diffraction grating. If the first-order maximum occurs at 20.40, what is the spacing between adjacent grooves in the grating? (In this problem, assume that the light is incident normally on the grating.) um

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