Question
(a) What visible wavelength has its fourth-order maximum at an angle of $25.0^\circ$ when projected on a 25,000-line-per-centimeter diffraction grating? (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?
1. $42.3 \textrm{ nm}$
2. $42.3 \textrm{ nm}$ is shorter than the shortest wavelength in the visible spectrum ($380 \textrm{ nm}$
3. The number of lines per centimeter is too large.
Solution Video