When a grating having 5000 lines/cmis illuminated by monochromatic light,the angle between the central maximum and the fourth order maximum is 47.2°.What is the wavelength of the light?

Question

Quizplus · Accepted Answer

The grating equation is d*sin(θ) = m*λ, where d is the distance between grating lines (1/5000 cm), θ is the angle, m is the order, and λ is the wavelength. Solving for λ with m=4 and θ=47.2° gives approximately 367 nm.

When a Grating Having 5000 Lines/cmis Illuminated by Monochromatic Light,the