Physics (AS & A Level) · Oct / Nov 2017 · Paper 11 · Question 30

A diffraction grating is used to measure the wavelength of monochromatic light, as shown in the diagram. The spacing of the slits in the grating is 1.00 × 10⁻⁶ m. The angle between the first order diffraction maxima is 70.0°. What is the wavelength of the light?

1. A287 nm
2. B470 nm
3. C574 nm
4. D940 nm

As printed in the paper