Question 4: Switch on your light source. Make sure it is shining onto a wall. Hold your largest clear plastic square between the light source and the wall. 4.1. 4.2. 4.3. What do you observe? Now do the same with the second clear plastic square. B What do you observe? Now do the same with the third clear plastic square. What do you observe? 4.4. What differences do you observe between the shadows of the three shapes?​