8.3.2—Experiments that demonstrate two-source interference

Place two coherent sources a known separation apart and observe alternating reinforcement and cancellation along a screen or ripple tank.

Keep source frequency and geometry stable, identify a central maximum and measure fringe spacing or nodal lines.

Two microwave horns fed by one oscillator produce repeated high and low signal positions as a detector is moved across the pattern.

A single source with reflections can make a standing pattern, but it is not automatically the same as a two-source interference geometry.