The total energy carried by the light wave when it travels from a rarer to a non reflecting and non absorbing medium 1) increases 2)either increases or decreases depending upon angle of incidence 3) decreases 4)remains same
When light passes from a rarer to a non-reflecting, non-absorbing medium, the energy remains the same because:
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No reflection : All light passes through.
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No absorption : The medium doesn't take any energy from the light.
Hence, the energy carried by the light wave doesn't change.