White Light Is Spread Out into Spectral Hues by a Diffraction

question 65

Multiple Choice

White light is spread out into spectral hues by a diffraction grating.If the grating has 1 000 lines per cm,at what angle will red light ( $\lambda$ = 640 nm) appear in first order?

• A)14.7\(\degree\)
• B)7.35\(\degree\)
• C)17.7\(\degree\)
• D)3.67\(\degree\)
• E)1.84\(\degree\)

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