<![CDATA[Alfred's Serif Users' Forums — Light travelling in glass]]> https://punster.me/serif/viewtopic.php?id=976 Mon, 07 Jul 2025 18:48:05 +0000 PunBB <![CDATA[Re: Light travelling in glass]]> https://punster.me/serif/viewtopic.php?pid=7368#p7368 Thanks to dispersion, the speed of a wave depends on its frequency, so the speed of light through glass is different for each colour. A prism gives us the classic example of dispersion.

The frequency of the wave will be affected by the density and temperature of the medium through which it is travelling. A denser or colder medium will lower the frequency.

]]> Mon, 07 Jul 2025 18:48:05 +0000 https://punster.me/serif/viewtopic.php?pid=7368#p7368 <![CDATA[Light travelling in glass]]> https://punster.me/serif/viewtopic.php?pid=7367#p7367 There is a very nice image in the following thread.

A Lesson in Light Frequencies and Wavelengths

https://forum.affinity.serif.com/index. … avelengths

This got me thinking.

https://en.wikipedia.org/wiki/Speed_of_light

As the speed of light in glass is slower than in vacuum, I am wondering what is the situation about frequency and wavelength of the light while it is travelling through glass, such as in a lens?

I have never known any mention of that in courses in optics and I have not seen it mentioned in books on optics.

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