Download - Light Energy Sources And Reflection
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LIGHT ENERGY – SOURCES &
REFLECTION OF LIGHT
Christine Tan4E
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What is energy?• Energy is the ability to do __________.
• Energy has different forms. Can you name some of them?
work
Light energy
Sound energy Heat energyElectrical energy
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Uses of light energy• Light energy helps us to __________.
• Plants use light energy from the sun to _____ ______ .
see
make food
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Sources of light
• Anything that gives out light of its __________ is a source of light.
• The _____ is the Earth’s main source of light.
• Can you name other natural sources of light?
own
Sun
firefly lightning burning fuel
fireworks Glow-worm
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Reflection of light• We see an object when light ____ on it
and _______ into our ______. falls
reflects
reflects eyes
moon
• The moon is not a source of light but appears bright because it ______ light from the ______. Sun
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How colours affect reflection• We cannot see any colours on a black
object because the light has been _______ by the object.
• It is advisable for pedestrains to wear light coloured clothes at night because white or light coloured clothes _______all or most of the light and so can be seen at night.
absorbed
reflect
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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?
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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.