PowerPoint Presentation: Optical refraction ? We need : 1 glas, water , 1 coin We put the coin on a table and put a glas above. We pure some water in the glas Upps , where is the coin gone ? We can see the coin from above. ?
PowerPoint Presentation: Optical refraction ? We can see the coin in case there is only air in the glas, but we can‘t see the coin from the side in case there is some water in. Children try to understand and come along that water seems to be some kind of fence for the light . But why do we see the coin from the top but not from the side ? Some children have glasses and know that these make the light ray go a little different, perhaps this is happening as well with the light ray coming from the coin going through the glass and water . !