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Ray and Beam.


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RayBeam
A ray is a concept widely used in optics,ray is an idealized narrow beam or a column of light.Beam is a narrow projection of a set of particles or waves.collection of rays
A ray cannot be observed physically and has a zero width.Beam has a finite width,and it can be observed physically.
Rays are discussed under light .Beams are discussed in both waves and particles and possess properties such as wavelength,amplitude and phase.

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