Explain the following giving reasons When light travels from a rarer to a denser medium, the speed decreases. Does the reduction in speed imply a reduction in the energy carried by the light wave?:

No, the reduction in speed does not imply a reduction in energy. The energy of a light wave depends on its frequency (E = hν), which remains unchanged when light enters a denser medium. Only the wavelength and speed are affected, not the energy.

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