Physics (AS & A Level) · May / June 2025 · Paper 12 · Question 31

Light of a single wavelength is incident normally on a double slit. Interference fringes are observed on a screen. The distance from the double slit to the screen is 0.60 m and the fringe separation is 1.8 mm. The distance from the double slit to the screen increases by 0.90 m. What is the new fringe separation?

1. A1.2 mm
2. B2.7 mm
3. C4.5 mm
4. D5.4 mm

As printed in the paper