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It explains the theories of light pictorially. It explains mathematical equations of Maxwell and postulates of Planck quantum theory.
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A body can absorb and emit discontinuously tiny packets of energy known as quantum. Quantum physics Classical physics Energy-frequency relationship The amount of energy less than a quantum is neither emitted nor absorbed. Light emits whole number multiples of quantum. (Maxwell’s equations) (Postulates of Planck theory) De-Broglie explained dual nature of light based on these two theories.