Physics (AS & A Level) · Feb / March 2016 · Paper 12 · Question 26

Monochromatic light of wavelength 5.30 × 10⁻⁷ m is incident normally on a diffraction grating. The first order maximum is observed at an angle of 15.4° to the direction of the incident light. What is the angle between the first and second order diffraction maxima?

1. A7.7°
2. B15.4°
3. C16.7°
4. D32.1°

As printed in the paper