A student shines a red laser of wavelength 650 nm650\text{ nm}650 nm normally at a diffraction grating. The second-order diffraction maximum is observed at an angle of 40.5∘ 40.5^\circ\,40.5∘ to the central zero-order maximum.
What is the number of lines per millimetre of the diffraction grating?
250 lines/mm250\text{ lines/mm}250 lines/mm
500 lines/mm500\text{ lines/mm}500 lines/mm
1000 lines/mm1000\text{ lines/mm}1000 lines/mm
1200 lines/mm1200\text{ lines/mm}1200 lines/mm
37 exam-style questions on AQA A Level Physics Refraction, diffraction and interference, covering Interference, Diffraction, and Refraction at a plane surface. Each one has a worked solution and a mark scheme showing where the marks go.