White Light Is Spread Out into Spectral Hues by a Diffraction

question 40

Multiple Choice

White light is spread out into spectral hues by a diffraction grating. If the grating has 1000 lines per cm, at what angle will red light (λ = 640 nm) appear in first order?

• A) 14.7°
• B) 7.35°
• C) 17.7°
• D) 3.67°
• E) 1.84°

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