Wave Optics · Interactive
Two-Source
Interference
Young's Experiment
Path-Difference Method
λ
Wavelength
a
Source Separation
D
Screen Distance
Δφ
Source Phase
0°
Apparatus · drag the green probe
Screen →
Waves
Rays
Wavefronts
Play
Antinodal lines
Free probe
At Screen Probe
— neutral —
Path Difference ΔL
0.00
λ
Phase Difference Δφ
0.0
°
Superposition at P · continuous
Click or drag anywhere on the screen line to move the probe. Bright fringes:
ΔL = nλ
. Dark fringes:
ΔL = (n + ½)λ
.