Abstract
The energy of a light beam is not spread but is concentrated in certain regions, which propagate like particles. He called these ‘particles’ photons. the observations indicated that light energy is emitted in multiples of a certain minimum energy unit. The size of the unit, which is called a quantum, depends on the wavelength of the radiation Plank’s hypothesis did not require that the energy should be emitted in localized bundles and it could, with difficulty, be reconciled with the electromagnetic wave theory. The light is one from of energy. Scientifically speakiy there are three types of formula to express light: the power, energy and the Intensity of light.
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