Physics (AS & A Level) · May / June 2020 · Paper 11 · Question 29

Light of a single wavelength is incident normally on two slits that are 0.20 mm apart. Interference fringes are observed on a screen that is 5.4 m away from the slits. The distance between successive bright fringes is 12 mm. What is the wavelength of the light?

1. A440 nm
2. B540 nm
3. C650 nm
4. D900 nm

As printed in the paper