Physics (AS & A Level) · May / June 2022 · Paper 12 · Question 30

The equation \[\lambda = \frac{d \sin\theta}{n}\] is used to calculate the wavelength \(\lambda\) of light in an experiment that uses a diffraction grating. The light from the diffraction grating is displayed on a screen. What do the symbols \(n\) and \(d\) represent?

1. An: number of slits in the grating; d: distance between adjacent slits in the grating
2. Bn: number of slits in the grating; d: distance from grating to screen
3. Cn: order of intensity maximum; d: distance between adjacent slits in the grating
4. Dn: order of intensity maximum; d: distance from grating to screen

As printed in the paper