Diagram of rays at a surface, where is the angle of refraction.
The wavefronts of a plane wave are planes.
Simple ray diagram showing typical chief and marginal rays
Wavefronts change shape after going through a lens.
Rays and wavefronts
Rays and wavefronts

In optics a ray is an idealized geometrical model of light, obtained by choosing a curve that is perpendicular to the wavefronts of the actual light, and that points in the direction of energy flow.

- Ray (optics)

Such directions of energy flow, which are always perpendicular to the wavefront, are called rays creating multiple wavefronts.

- Wavefront
Diagram of rays at a surface, where is the angle of refraction.

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