When light illuminates a grating with 7000 lines per centimeter, its second order maximum is at 62.4°. What is the wavelength of the light?
A)336 nm
B)363 nm
C)452 nm
D)633 nm
E)752 nm

Question

Quizplus · Accepted Answer

The grating equation is d*sin(θ) = m*λ, where d is the distance between lines (1/7000 cm), θ is the angle (62.4°), m is the order (2), and λ is the wavelength. Solving for λ gives approximately 633 nm.

When Light Illuminates a Grating with 7000 Lines Per Centimeter