Waves are any regularly recurring event that can be thought of as a disturbance moving through a medium. Waves are characterized by wavelength, frequency, and the speed at which they move.

Source: DrPhysicsA

Looking at transverse and longitudinal waves, the electromagnetic spectrum, polarisation, interference, the single slit and double slit experiments, a diffraction grating, refraction and refractive indices.

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A Level Physics – wave

Waves are any regularly recurring event that can be thought of [...]