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# Light energy

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### Light energy

1. 1. Light Energy
2. 2. What is light Energy? Remember in the beginning of the year?1. light is not a matter. it enable us to seeQuestion 1: Name one thing that uses light to carry out work (Note things need energy to do work)Plants! (Photosynthesis!)
3. 3. Sources of light Are things that give out Nature sources: Can you name some?a) These object give out light naturally Artificial Sources: Suggest somea) These give out light by using man-made power source, ex. batteries
4. 4. How do we see things Eyes*Note: thisdrawing mightnot be accurate,light are usuallyreflected at thesame angle
5. 5. Characteristic of Light  Travels in straight lines (although Albert Einstein prove it wrong as it doesn’t travel in straight lines in some circumstances :P
6. 6. •Is a material that allow NOLIGHT to pass through•Like: (name some)•Is a material that allow SOMELIGHT to pass through•Like: (name some)•Is a material that allow ALLLIGHT to pass through•Like: (name some)
7. 7. BookA Shadow is form!
8. 8. How are shadow form Since light travels in straight line, and when light is partially or completely block by an:1. Opaque(completely)2. Translucent(partially)
9. 9. How to change size of ashadow To make it smaller and clearer:1. Place object closer to the screen2. Place screen closer3. Place light source further To make it bigger and bluer:1. Place object further from screen2. Place screen further3. Place light source closer
10. 10. How to change shape of the shadow Change the position of light source:Ex:
11. 11. How to change the length Change the position of the light sourceEx: 。