A helium-neon laser (? = 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


a

Physics & Space Science

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