Wave Interference Transparency

DCS Code: 3B50.50 Last Updated: March 27, 2026
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Purpose

Demonstrates constructive and destructive interference in a double-slit geometry using a projected transparency. Students see how path difference from two coherent sources determines where maxima and minima appear on a screen. Provides visual foundation for Young's double-slit experiment.

Projected transparency showing two side-by-side diagrams of double-slit interference. Each diagram has two point sources at the bottom with circular wavefronts, sinusoidal wave patterns along two paths converging at a screen (horizontal bar) at top. The left and right panels show different phase alignments at the screen.
Figure 1: Projected transparency showing double-slit interference. Two point sources emit circular wavefronts; sinusoidal waves travel along paths to a screen at top. The two panels show constructive and destructive interference at different screen positions.