Physics (AS & A Level) · May / June 2019 · Paper 12 · Question 31

A student sets up apparatus to observe the double-slit interference of monochromatic light, as shown. [diagram: monochromatic light source, double slit, screen] Interference fringes are formed on the screen. Which change would increase the distance between adjacent fringes?

1. ADecrease the distance between the two slits.
2. BDecrease the width of each slit.
3. CMove the screen closer to the double slit.
4. DUse light of a higher frequency.

As printed in the paper