Physics (AS & A Level) · Oct / Nov 2016 · Paper 11 · Question 29

A diffraction grating is used to measure the wavelength of monochromatic 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 in the diagram. What is the wavelength of the light?

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

As printed in the paper