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

question 29

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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