Question: Visible light is incident perpendicularly on a diffraction grating of 200rulings/mm. What are the (a) Longest, (b) Second longest, and (c) Third longest wavelengths that

Visible light is incident perpendicularly on a diffraction grating of 200rulings/mm. What are the

(a) Longest,

(b) Second longest, and

(c) Third longest wavelengths that can be associated with an intensity maximum at θ = 30.0o?

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