Question: A beam of 541-nm light is incident on a diffraction grating that has 400 lines/mm. (a) Determine the angle of the second-order ray. (b) If

A beam of 541-nm light is incident on a diffraction grating that has 400 lines/mm.
(a) Determine the angle of the second-order ray.
(b) If the entire apparatus is immersed in water, determine 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.

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