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The presenter explains that the only things you can see are light sources or reflectors, which are objects that reflect light. If you were a reflective object, you could be seen by someone with a light source, but you wouldn't be able to see any reflective objects. However, with a light source, you could see reflective objects as well are being visible yourself.
This clip is from:
First broadcast:
17 May 2007

Classroom Ideas

Students could try and determine experimentally why reflective jackets use specific materials, by testing a variety of different materials and deciding which reflects the most light. This could be expanded and linked into a possible road safety project. As well as considering reflectivity, discuss with student the angle of reflection and how this might relate to the perceived lightness or dimness of light.

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