B. Moving a denser medium
When light moves from a less dense medium to a denser medium, such as from air to glass or water, it slows down. This is because the denser medium causes the photons of light to interact more with the atoms and molecules within the medium, leading to a decrease in speed.
What causes light to slow down? A. Moving a less adhesive medium b. Moving a denser medium c. Moving a lighter medium d. Moving into a vacuum
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