Straight Lines
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The document discusses an experiment with cards that have holes. When the holes are lined up, light can pass through both cards and be seen, but when the holes are offset light cannot pass through and cannot be seen. This is because light travels in straight lines and cannot change direction. The document also notes that when an object blocks light, like a ball, it casts a shadow, and anything light cannot pass through is called opaque.
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Straight Lines
- 1. In the back of your book unscramble these light words. straghit sawdoh peaqup straight opaque shadow
- 3. Must know that light travels in straight lines. Should know there are some things that light can not get through Could know that we say these things are opa que
- 4. This is the experiment you are going to do. Get your pieces of card. Put them on your desk with the holes lined up. Can you see the light when you look through them? Now move one piece of card so that the holes do not line up. Can you see the light now? Use the diagrams you have been given to try and explain what you have seen. Remember to draw light rays with a ruler and with an arrow on them.
- 5. The ray of light can get through the holes. We can see the light.
- 6. The ray of light can not get through the holes. We can not see the light. This is because ……………………………………………………………….. light travels in straight lines
- 7. The rays of light can not get around the ball. The rays of light can not get through the ball. This is why there is a _____________ on the screen. An object that light cannot get through is ________________. Light blocked here opaque shadow