A Helium-Neon Laser $\lambda$ = 6328 Nm) Is Used to Calibrate a Diffraction Grating

question 7

Multiple Choice

A helium-neon laser ( $\lambda$ = 632.8 nm) is used to calibrate a diffraction grating.If the first-order maximum occurs at 20.5 $\degree$ , 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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