I read the stackexchange question on the topic but the answers are too complex for me
In: Physics
because light is a continuous electromagnetic field.
Hardly ELI5, but imagine two close points in space, and be also imagine they had a slightly different frequency. While one point is oscillating, eventually the other point (as it is faster) will end up one cycle ahead, and later even more cycles ahead.
How would the continuous(!) field in-between look like? it could not! Therefore the frequency must be the same everywhere.
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