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A 560 lines/mm diffraction grating is in an empty aquarium tank. The index of refraction of...

A 560 lines/mm diffraction grating is in an empty aquarium tank. The index of refraction of the glass walls is nglass = 1.50. A helium-neon laser (λ = 633nm) is outside the aquarium. The laser beam passes through the glass wall and illuminates the diffraction grating.

1) What is the first-order diffraction angle of the laser beam?

2) What is the first-order diffraction angle of the laser beam after the aquarium is filled with water ( nwater = 1.33)?

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