Physics (AS & A Level) · Feb / March 2018 · Paper 12 · Question 27

Monochromatic light is incident on a pair of narrow slits a distance of 0.1 mm apart. A series of bright and dark fringes are observed on a screen a distance of 2.0 m away. The distance between adjacent bright fringes is 8.0 mm. What is the path difference between the light waves from the two slits that meet at the second order dark fringe?

1. A2.0 × 10⁻⁷ m
2. B4.0 × 10⁻⁷ m
3. C6.0 × 10⁻⁷ m
4. D8.0 × 10⁻⁷ m

As printed in the paper