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Light: Wave-particle duality

Light: Wave-particle duality Creative commons image Credit: By Douglas Hofstadter [CC-BY-SA-3.0], via Wikimedia Commons
Introductory level Duration 10 mins Updated 11 Sep 2013
One of the most confusing concepts in physics, wave-particle duality is unlike anything we see in the ordinary world.

Hidden visions

Hidden visions Copyrighted image Credit: BBC
Introductory level Duration 5 mins Updated 03 Aug 2006
Abbe's mathematical research revolutionised photography and his philanthropy opened up opportunities for people who, like him, had humble beginnings.

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Telescopes and spectrographs

Free CourseFree Course
Telescopes and spectrographs Copyrighted image Credit: Used with permission
Intermediate level Duration 10 hours Updated 27 May 2011
This unit looks at how telescopes and spectrographs are designed to improve our ability to observe the universe. You will examine how different...