Physics (AS & A Level) · May / June 2022 · Paper 13 · Question 31

A beam of light of wavelength 400 nm is incident normally on a diffraction grating that has 300 lines per millimetre. The light passes through the grating and produces a series of maxima which are observed on a semicircular screen, as shown. What is the total number of maxima observed on the screen?

1. A8
2. B9
3. C16
4. D17

As printed in the paper