Interference and Diffraction Concept

Demonstrations in Interference and Diffraction

Top: a single transparency showing concentric semicircular rings representing wavefronts from one source. Bottom: two transparencies overlapped with centers offset, producing a moiré interference pattern with hyperbolic bright and dark fringes.

Moiré Patterns

Visualizes two-source wave interference using overlapping transparencies printed with concentric rings. Students observe how moiré fringes representing constructive and destructive interference change as the "source" separation varies.

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.

Wave Interference Transparency

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 …