A wavefront is the locus of all the particles which are in phase. A wavelet is an oscillation that starts from zero, then the amplitude increases and later decreases to zero. …

The locus of all particles in a medium vibrating in the same phase is called wave front Wf. The direction of propagation of light ray of light is. perpendicular to Wf. This is called secondary wavefront. Application of Huygens principle to study refraction and reflection.

When applied to the propagation of light waves, this principle states that: Every point on a wave-front may be considered a source of secondary spherical wavelets which spread out in the forward direction at the speed of light. The new wave-front is the tangential surface to all of these secondary wavelets.

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Drawing a basic wave

1. Sketch in the basic shape of the curl, spray, foam and base of the wave.
2. Add an extra line running parallel and below the curl line to define the thickness of the lip.
3. Add a flow line starting at the lip and curve it around to suggest roundness of the liquid lip.
4. Add the rest of the flow lines.

The wavefunction is a real physical object after all, say researchers. At the heart of the weirdness for which the field of quantum mechanics is famous is the wavefunction, a powerful but mysterious entity that is used to determine the probabilities that quantum particles will have certain properties.

Isaac Newton

The idea of a wave packet is that you superimpose a lot of plane waves to create a localized free electron. But when and why is this useful? It seems that wave packets are often used to derive transport equations inside solids.