Understanding Light: Sources and Properties

What is light?
 
Light is a form of energy that travels in waves. Light waves enables
us to see objects. Some objects emit light and some reflect light.
The sun
 
The sun is our
biggest natural
light source.
When the sun
rises at dawn,
daylight breaks
upon the Earth.
Light waves
 
Light waves travel
in straight lines.
Sometimes we can
see the sun’s rays
beaming through
the clouds
The moon
 
The moon often
appears bright in
the night sky but it
does not generate
its own light.
The light shining
from the moon  is
a reflection of the
sun’s rays.
Natural light
 
Natural light is also
emitted from fire.
Before we had
electricity people
used fire and
candles to light
their homes in the
evening time.
Lightning
 
Lightning during a thunderstorm is also a  natural light source.
Light in insects
 
Some animals such
as fireflies and
glow-worms
generate and emit
their own light.
These are called
luminous.
Light in fish
 
Lantern fish are also luminous.
Artificial light
 
As well as natural
light sources we also
have artificial light
sources.
They are usually
powered by
electricity.
Electricity
 
Nowadays we use electric light bulbs to provide light indoors.
Street lights
 
Across the globe in villages, towns and cities,
we use street lights to illuminate the streets at night time.
Flood lights
 
We use flood lights
to enable us to play
sports and do
outdoor activities in
the evening time.
This is very useful
during the winter
season.
Screen lights
 
Other artificial light sources include mobile phone and laptop screens.
Standby functions
 
When some household appliances are
left on standby they emit a tiny light
Event lighting
 
Artificial lighting can be extremely effective
when it comes to lighting big outdoor events.
Mood lighting
 
It can also be very effective in the home,
creating a certain mood or feel.
 
Illustrations
 
Shutterstock
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Light is a vital form of energy that enables vision and is emitted or reflected by various sources. Learn about natural sources like the sun, moon, fire, lightning, and luminous animals, as well as artificial sources powered by electricity. Discover how light waves travel, illuminating our world and aiding visibility both naturally and artificially.


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  1. What is light? Light is a form of energy that travels in waves. Light waves enables us to see objects. Some objects emit light and some reflect light.

  2. The sun The sun is our biggest natural light source. When the sun rises at dawn, daylight breaks upon the Earth.

  3. Light waves Light waves travel in straight lines. Sometimes we can see the sun s rays beaming through the clouds

  4. The moon The moon often appears bright in the night sky but it does not generate its own light. The light shining from the moon is a reflection of the sun s rays.

  5. Natural light Natural light is also emitted from fire. Before we had electricity people used fire and candles to light their homes in the evening time.

  6. Lightning Lightning during a thunderstorm is also a natural light source.

  7. Light in insects Some animals such as fireflies and glow-worms generate and emit their own light. These are called luminous.

  8. Light in fish Lantern fish are also luminous.

  9. Artificial light As well as natural light sources we also have artificial light sources. They are usually powered by electricity.

  10. Electricity Nowadays we use electric light bulbs to provide light indoors.

  11. Street lights Across the globe in villages, towns and cities, we use street lights to illuminate the streets at night time.

  12. Flood lights We use flood lights to enable us to play sports and do outdoor activities in the evening time. This is very useful during the winter season.

  13. Screen lights Other artificial light sources include mobile phone and laptop screens.

  14. Standby functions When some household appliances are left on standby they emit a tiny light

  15. Event lighting Artificial lighting can be extremely effective when it comes to lighting big outdoor events.

  16. Mood lighting It can also be very effective in the home, creating a certain mood or feel.

  17. Illustrations Shutterstock

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