CAPE Physics Unit 1 · 2009 · Paper 1 · Question Q26

In a Young's two-slit experiment, light of wavelength 500\text{ nm} produces fringes 2\text{ mm} apart on a screen. If light of wavelength 250\text{ nm} is used and the slit separation is doubled, how far apart would the fringes be?

1. (A)4\text{ mm}
2. (B)0.5\text{ mm}
3. (C)1\text{ mm}
4. (D)2\text{ mm}