Submitted by TheGandPTurtle t3_111g7s9 in askscience
Monadnok t1_j8ij84r wrote
Reply to comment by Stillcant in Light traveling through a medium that slows it. Does the same photon emerge? by TheGandPTurtle
Someone below pointed out the gravity analogy. Another is a spring, where an object can do work on the spring, and then the spring can return the energy by doing work on the object.
As Feynmann's lecture points out, the electrons that are worked by the applied electric field of the photon can be considered to be "fastened" to the atoms of the materials by a "spring". So the incoming photon moves the electron against a "spring", and the spring returns the energy by working on the electron, which produces a new oscillating electric field to add to the field of the incoming photon.
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