A helium-neon laser (λ = 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

Question

Quizplus · Accepted Answer

The correct answer is A.The line spacing, d, can be calculated using the formula:d = λ / sin(θ)where λ is the wavelength of the light and θ is the angle of the first-order maximum.Plugging in the given values, we get:d = 632.8 nm / sin(20.5°) = 1.81 × 10−6 m

A Helium-Neon Laser (λ = 632