Uploaded May 2021 | Updated September 2026, 44 minutes ago

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Thermal Radiation, in the form of Infra Red, is closely related to visible light and can be brought to a focus using a simple parabolic mirror.
In this demonstration I show how this focusing effect can be used to start a small fire.

I apologise for a slight continuity error in terms of my clothing. When reviewing my original footage I found a slight problem, so decided to refill part of the video (mid way through a cycle ride!)