A ray of light travels from a less dense medium to a denser medium. How are the speed and frequency of the light affected? The speed
When light travels from a less dense medium (like air) to a denser medium (like glass or water), its speed decreases due to the higher optical density of the new medium.
The frequency of light remains constant when it passes from one medium to another. Although the speed changes, the frequency is determined by the source of the light and does not change with the medium.
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