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A beam of 635 nm light is incident on a diffraction grating that has 340 grooves/mm.
(a) Determine the angle of the second-order ray.
(b) If the entire apparatus is immersed in water, what is the new second-order angle of diffraction?
(c) Show that the two diffracted rays of parts (a) and (b) are related through the law of refraction, by calculating nsin(0)
for each part.
[for part (a)]
[for part (b)]

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