Physics (AS & A Level) · Oct / Nov 2023 · Paper 13 · Question 29

A diffraction grating is used to measure the wavelength of light. The spacing of the slits in the grating is 1.15 × 10⁻⁶ m. The angle between the first-order diffraction maxima is 60.0°, as shown. [diagram: grating with light incident, first-order maxima at 60.0°] What is the wavelength of the light?

1. A288 nm
2. B498 nm
3. C575 nm
4. D996 nm

As printed in the paper