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◦•●◉✿When the body approaches the speed of light, the body's length appears to contract in the direction of travel, and its mass appears to increase from the point of view of a stationary observer. Only photons move to light velocity. They don´t have length.✿◉●•◦
As waves travel into the denser medium, they slow down and wavelength decreases.
Step-by-step explanation:
The denser the medium the slower the waves (speed of light) travels.