PREVIEW

... he refractive index of visible light varies in different environments, such as glass, air, water, and so on.

These things have a unified term in concept, which is medium.

Nowadays, with optical theoretical research gradually becoming standardized, many middle school students have also understood a principle:

Light can propagate in a medium, but the propagation of light itself does not require a medium.

But don’t forget, Little Niu is in 1665, a period when optical ...

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