Our Science topic this term is ‘Light’. We carried out an investigation into how refraction changes the direction in which light travels. After considering why a straw in a glass of water looks broken, we experimented with different images moving towards and away from a glass of water.
We discovered that refraction creates illusions. Light bends when it travels between air and water or glass, so objects seen through these materials look bent or distorted.
We were amazed to find that our image reversed as it moved further away.
After discussion and using our scientific knowledge, we were able to explain this. Because the glass is curved, it also acted as a lens, focusing the rays of light. Where the light all comes together is called the focal point, but beyond the focal point the image appeared to reverse. The rays of light that were bent crossed each other, so that the light from the left of the arrow became right, and light from the right of the arrow was then on the left. This is what caused the arrow to appear reversed.
Next week, we are investigating how shadows are formed…