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 wecan name in 90 seconds!

Luminous Sources

The most important luminous source is the sun.

Others include:– Fire– Electric Lights– Fireworks– Lightning

Non-Luminous Objects

Non-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 Worksheet

1. 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 Sea

Deep 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

Bioluminescence

Bioluminescence 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