Question

Question 7:
A helium-neon laser (a = 632.8 nm) is used to calibrate a diffraction grating. If
the first-order maximum occurs at 20.50, what is the spacing between adjacent
grooves in the grating?
(A) 3.65 mm
(B) 1.81 mm
(C) 2.89 um
(D) 1.81 um
Choose correct option

Answer 1

Answer:

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