Optics & Waves
Advanced

Double-Slit Fringe Spacing

Spacing of interference fringes on a screen.

Formula

Δy=λLd\Delta y = \frac{\lambda L}{d}

Variables

\lambdaWavelength
LScreen distance
dSlit separation

Did You Know?

Young's double-slit experiment proved light is a wave, and later revealed the deep strangeness of quantum mechanics.

interferenceyoungdouble slit