Interference

The interaction between two, or more, waves.

  1. Superposition of Waves

  2. Coherence and Path DIfference

  3. Phase and Phase Difference

 

1. Superposition of Waves

Waves can pass through other waves, like ripples on a pond, with their combined amplitude the sum of the individual displacements at any one time - the principle of superposition.

 

2. Coherence and Path Difference

Coherent waves have a constant phase difference.

Coherence, path difference and phase difference are really important subjects to consider when we look at the interference of waves and how this leads onto double slit and diffraction grating patterns.

 

3. Phase and Phase Difference

A little more about these two terms and why we measure the phase difference of a waves in degrees or radians.