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Frequency never changes since it depends only on source.

Speed can either increase or decrease, depending on the direction of travel of light. This would cause an increase or decrease in wavelength respectively.

Speed increases when light travels from an optically denser medium to an optically less dense one. (For example, when light travels from water to air)

Speed decreases when light travels from an optically less dense medium to an optically denser medium.

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Q: What happens to the speed and wavelenght and frequency of a wave when it reaches the boundary between two media?
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