A Helium-Neon Laser (λ = 632

question 28

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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