Physics (AS & A Level) · May / June 2026 · Paper 14 · Question 29

Light of wavelength 500 nm is incident normally on a double slit. A flat screen is placed parallel to the plane of the double slit. The screen is at a distance of 3.5 m from the double slit. A series of bright and dark fringes is formed on the screen. The distance from the centre of the first bright fringe to the centre of the tenth bright fringe is 22 mm. What is the separation of the two slits?

1. A0.080 mm
2. B0.35 mm
3. C0.72 mm
4. D0.80 mm

As printed in the paper