from bonfires to lasers
Hot objects give out light.
Sunset in Venice
Stars and galaxies give out light.
Picture: Liverpool Telescope
A worm living in dark caves sends out light from its tail.
Liquid droplets form a string of shining beads to attract insects.
tail of worm
Some cold things give out light:
How do we see light sources?
Light travels from a source to our eyes.
We can see sources in a dark room.
If there is no light
we cannot see anything!
Let’s try a test–
Put a few small objects into the black bag-----
How do we see things that are not sources of light?
Light bounces off
and some reaches our eyes.
How do you know that the baby squirrel watches as it feeds?
When light bounces off something
we say the light is reflected.
We can try this with
and shiny surfaces.
Light is reflected as a beam and can be seen on the wall.
Move the mirror
The light reaches a different place on the wall.
Look in a mirror