A Helium-Neon Laser (λ = 632

question 15

Multiple Choice

A helium-neon laser (λ = 632.8 nm) is used to calibrate a diffraction grating. If the first-order maximum occurs at 20.5°, what is the line spacing, d?

• A)1.81 × 10−6 m
• B)1.00 × 10−5 m
• C)1.00 × 10−4 m
• D)1.31 × 10−6 m
• E)6.76 × 10−7 m

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