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the claim

Light slows down when passing through water.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
4 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that light slows down when passing through water?

Yes. A reference source states directly that light slows as it travels through a medium other than vacuum, explicitly including water. Other items describe slowing in glass or photonic crystals, supporting the general phenomenon but not water specifically.

Verdict: SUPPORTED · 4 sources for, 0 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 4
Why glass slows down light phase velocity without slowing the propagation speed of its photons which are travelling at constant speed c inside the glass?
2021
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Emmanouil, M. (2021). Why glass slows down light phase velocity without slowing the propagation speed of its photons which are travelling at constant speed c inside the glass?. zenodo.org. https://doi.org/10.5281/zenodo.5717094

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More for · 3
Refraction - Wikipedia
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Refraction - Wikipedia. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Refraction

Topological Radar
2026
Get citation
Topological Radar. (2026). doi.org. https://doi.org/10.5281/zenodo.21301899

Light pulse propagation in three-dimensional photonic crystals
Get citation
Light pulse propagation in three-dimensional photonic crystals. (n.d.). cir.nii.ac.jp. https://doi.org/10.1557/proc-708-k1.3

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