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A photon is the fundamental particle of light energy.

Simple explanations in physics are seldom completely correct and can give people the wrong idea about things that can only be explained by mathematics. Especially so when talking about the most fundamental matters.

Light can be a particle (photon) or a wave (frequency) depending on what you are talking about. A bit like a man can be a husband and a father. Different things, I am sure you will agree.

The word 'laser' is an acronym. Each letter stands for another word.

A L.A.S.E.R. (Light Amplification by Stimulated Emission of Radiation) is a machine that 'concentrates' and produces light that is 'in step'. All the photons are of the exactly same colour (frequency) and have the same energy values.

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