This Exploratorium web page offers an at-home experiment demonstrating how the radiation from an electric heater can be focused into a point, or "hot spot", in the same way that visible light rays are focused. The experiment description lists all the necessary supplies, steps, and procedures needed to carry out the experiment.
%0 Electronic Source %D September 1, 2008 %T Exploratorium Science Snacks: Hot Spot %I Exploratorium %V 2015 %N 4 October 2015 %8 September 1, 2008 %9 text/html %U http://www.exploratorium.edu/snacks/hot_spot/index.html
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