Physics (AS & A Level) · Oct / Nov 2021 · Paper 11 · Question 29

Green light is incident normally on a diffraction grating and forms a diffraction pattern on a distant screen. Which change, on its own, would decrease the separation of the diffraction maxima on the screen?

1. AIncrease the distance between the screen and the diffraction grating.
2. BReplace the diffraction grating with a grating that has a smaller separation between the slits.
3. CReplace the diffraction grating with a grating that has fewer slits per unit length.
4. DReplace the green light with red light.

As printed in the paper