The title says it all: this blog features physics videos found everywhere on the web: animations, demonstrations, lectures, documentaries.
Please go here if you want to suggest other nice physics videos, and here if I mistakingly infringed your copyrights. If you understand French, you'll find a huge selection of physics videos in French in my other blog Vidéos de Physique.

Monday, 12 September 2011

Transparency and Opacity

A material that is transparent in one part of the spectrum may be opaque in another. Here, we see normal window glass is transparent to visible light (obviously) but opaque to the thermal infrared, as shown by an infrared camera. Similarly, a garbage bag blocks visible light but passes infrared.

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