Physics (AS & A Level) · Oct / Nov 2019 · Paper 13 · Question 30

Light of wavelength 567 nm is incident normally on a diffraction grating. The grating has 400 lines per mm. A number of diffraction maxima are observed on the far side of the grating. What is the angle between the second-order maximum and the third-order maximum?

1. A13.1°
2. B13.9°
3. C15.9°
4. D27.0°

As printed in the paper