question on light

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when light slows down in a glass tube, will its wavelengths change or stay the same?

since light slows down in a glass/a different medium, shouldn't its wavelengths changes accordingly to it?

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The wavelength in a medium is lambda/n, where n is the index of refraction

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Just to add to what swansont has said:

The refractive index can be understood as

$n = \frac{\textnormal{speed of light in vacuum}}{\textnormal{speed of light in medium}}$.

For pyrex we have $n= 1.474$, for common glasses $n = 1.52-1.62$.

You can now explore this with some numerical examples.

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According to formula Speed=frequancy*wavelengt

frequancy is fixed and glass decreases the speed.

So wavelenght will be decreased.

Edited by emrekanca

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