. . 3.1. 3.2. . 3.3. 3.4. Switch on your light source. Make sure it is shining onto a wall. Hold your largest plastic shopping bag square between the light source and the wall. What do you observe? Now do the same with the second plastic shopping bag square. What do you observe? Now do the same with the third plastic shopping bag square. What do you observe? What differences do you observe between the shadows of the three shapes?​



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