TOPIC 8 · AS LEVEL

Overlap the waves.
Reveal the pattern.

Use superposition to explain interference, stationary waves and diffraction—then turn optical patterns into precise measurements.

THE LEARNING PATH

From adding displacements to measuring wavelengths

Eight lessons connect the physical picture, phase conditions, stationary patterns and optical equations.

8.18 LESSONS · ACCURATE DIAGRAMS · WORKED PROBLEMS

Combine waves to explain interference, stationary-wave patterns, diffraction and optical fringe systems.

Calculate resultant amplitude, harmonic frequency, fringe spacing and grating angles.

Eight CIE-style problems with staged hints and full solutions.