Physics (AS & A Level) · May / June 2017 · Paper 13 · Question 27

Monochromatic light is incident on a diffraction grating and a diffraction pattern is observed. Which row shows possible effects of replacing the grating with one that has twice as many lines per millimetre?

1. Anumber of orders of diffraction visible: decreases; angle between first and second orders of diffraction: decreases
2. Bnumber of orders of diffraction visible: decreases; angle between first and second orders of diffraction: increases
3. Cnumber of orders of diffraction visible: increases; angle between first and second orders of diffraction: decreases
4. Dnumber of orders of diffraction visible: increases; angle between first and second orders of diffraction: increases

As printed in the paper