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Light Energy  Sources And Reflection
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Light Energy Sources And Reflection

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  • 1. LIGHT ENERGY – SOURCES & REFLECTION OF LIGHT Christine Tan4E
  • 2. What is energy? • Energy is the ability to do __________. work • Energy has different forms. Can you name some of them? Light energy Electrical energy Sound energy Heat energy
  • 3. Uses of light energy • Light energy helps us to __________. see • Plants use light energy from the sun to make food _____ ______ .
  • 4. Sources of light • Anything that gives out light of its __________ is a source of light. own • The _____ is the Earth’s main source of Sun light. • Can you name other natural sources of light? firefly lightning burning fuel fireworks Glow-worm
  • 5. Reflection of light • We see an object when light ____ on it falls and _______ into our ______. reflects eyes moon • The moon is not a source of light but reflects appears bright because it ______ light Sun from the ______.
  • 6. How colours affect reflection • We cannot see any colours on a black object because the light has been absorbed by the object. _______ • It is advisable for pedestrains to wear light coloured clothes at night because white or reflect light coloured clothes _______all or most of the light and so can be seen at night.
  • 7. How surfaces affect reflection • Smooth surfaces reflect light well. Where do you see smooth surfaces around you and why? Lacquer, Varnish, Gloss, Wax, Polish • Rough surfaces do not reflect light well. Where do you see rough surfaces around you and why?
  • 8. How colours affect reflection • Fluorescent colors seem to be brighter because they can reflect more light. Discuss with your partner where you have seen them being used.