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the claim

Light slows down inside glass and returns to its original speed once it exits the glass.

the verdict
INSUFFICIENT LEANING
Recorded sources
3 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 inside glass and returns to its original speed once it exits the glass?

Unclear. Two sources state that light travels more slowly inside a medium such as glass, but none of the retrieved items addresses whether light returns to its original speed once it exits the glass.

Verdict: PARTIAL LEAN · 3 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 · 3
Explaining Why Light Slows in Glass
2026
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Bieżanek, B. (2026). Explaining Why Light Slows in Glass. doi.org. https://doi.org/10.33140/atcp.09.02.02

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More for · 2
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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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). doi.org. https://doi.org/10.13140/rg.2.2.32740.09605/1

Why does light change direction when it travels through ...
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Why does light change direction when it travels through.... (n.d.). physics.stackexchange.com. https://physics.stackexchange.com/questions/13652/why-does-light-change-direction-when-it-travels-through-glass

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