A helium-neon laser (l = 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
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