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.