introducing light
DESCRIPTION
Introducing Light. Explain the difference between luminous and non-luminous objects. What objects can you see from where you are sitting that make their own light?. Luminous Sources. A luminous source is an object that can create light. Let’s see how many we can name in 90 seconds!. - PowerPoint PPT PresentationTRANSCRIPT
Introducing Light• Explain the difference between luminous and non-luminous objects.
What objects can you see from where you are sitting that make their own light?
Luminous SourcesA luminous source is an object that
can create light.
Let’s see how many wecan name in 90 seconds!
Luminous SourcesThe most important luminous source
is the sun.
Others include:– Fire– Electric Lights– Fireworks– Lightning
Non-Luminous ObjectsNon-luminous objects do not create
light.
So how are we able to see them?
We can see non-luminousobjects because of the lightreflected off of them.
Non-luminous objects
Objects which make their own light are ……………………
Objects which do not make their own light are ……………………
Luminous Source Worksheet1. Circle the luminous sources
2. Label the luminous sources
3. Draw how the one-armed man would be able to watch television.
4. Draw how the man would be able to see the chair.
Answers
Properties of Light
• Light travels in straight lines:
Light travels VERY FAST
- About 300,000 kilometres per second.
Fact or Opinion?What is the difference between fact and opinion?
Clue: If it is a fact then you could prove it is correct with an experiment!
Over many centuries, people have had very different opinions about what light is and how we see things.
Which are fact and which are opinion?
Light travels in straight lines.An object has to be luminous to be visible.Luminous objects give off light because
they are hot.If you close your eyes then the universe
may not exist until you open them.When you look at something, light travels
from your eyes to the object.
Scientific Fact
Opinion
Under The SeaDeep in the sea... It can be so deep
that light from the sun can not be seen.
How can animals survive down here?
Video Clip
BioluminescenceBioluminescence is where organisms
are able to create their own light.
These organisms are luminous sources.
Luminous Source Wipeout!
Find the 15 Luminous Sources
Avoid the Non-Luminous Objects!!!
MAGNESIUM REACTING
WITH OXYGEN
SWISS CHEESE
ANGLERFISH
COUNTRYMUSIC
STARS
TELEVISION
GLASS
AA BATTERY
LIGHT BULB
BICYCLEREFLECTORS
FLAME
TORCH
THE HUMANEYE
SPARKLERS
SNOW
MIRROR
DIAMONDS
LAMP
THE MOON
COMPUTERSCREEN
NEON SIGN
RAINBOW
FIREFLY
LIGHTNING
THUNDER
OTHERPLANETS
FIREWORKS
REFLECTORJACKETS
THE SUN
PLATINUMEAR RINGS