When light travels from a rarer to a denser medium, the speed decrease, but energy carried by the light wave remains unchanged. Energy of light depends on its frequency and number of light photons in given light beam and both these quantities remain unchanged.
Class 12 Physics Chapter 9 Ray Optics and Optical Instruments Session 2024-2025.
When light travels from a rarer to a denser medium, the speed decreases. Does this decrease in speed imply a decrease in the energy carried by the light wave?
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No, the decrease in speed does not imply a decrease in the energy carried by the light wave. The energy of light depends on its frequency, which remains unchanged when transitioning between media. Only the wavelength and speed are affected, not the energy.
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