# Refraction of light

Why the velocity of light changes in different medium?

Note by Zahid Hasan
4 years, 9 months ago

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This is how I see it:

Light always travels at $$c$$ no matter what. But when it travels through a medium [meaning when it doesn't travel in vacuum], it constantly gets absorbed and re-emitted by the atoms of the medium. But in between atoms, it travels at $$c$$. So technically light doesn't slow down [or change its speed]. Rather the atoms of the medium act as stop-signals.

Hope this helps!

- 4 years, 9 months ago