Physics (AS & A Level) · May / June 2023 · Paper 11 · Question 29

A beam of light from a laser is incident normally on a diffraction grating. The diagram shows only the second-order maxima that are produced. The grating has a line spacing of 1.0 × 10⁻⁶ m. The angle between the two second-order maxima is 110°. What is the wavelength of the light?

1. A4.1 × 10⁻⁷ m
2. B4.7 × 10⁻⁷ m
3. C8.2 × 10⁻⁷ m
4. D9.4 × 10⁻⁷ m

As printed in the paper