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GEOMETRICAL TRANSFORMATIONS AND SHADOWS

The shadows phenomenon, interpretable with the model of the straight propagation of the light, is an interesting way to introduce the geometrical transformations . In fact it offers the opportunity to make pupils explore real situations and connect mathematical concepts to everyday life.
Simple concepts about the light are the prerequisites for these activities:

  • What a light source is .
  • Light is invisible, but it spreads in every directions and it is diffused by the surfaces it meets.
  • Light travels straight. There is a correspondence between the physical body (light rays) and the geometrical body (straight lines).

The map below resumes the followed path:

 

Shadows produced by a near light source | Shadows produced by a far light source
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