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! 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-luminous objects because of the light reflected off of them. Objects which make their own light are …………………… Objects which do not make their own light are …………………… Non-luminous objects 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. Scientific Fact Opinion 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. 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 TELEVISION FLAME MIRROR NEON SIGN OTHER PLANETS SWISS CHEESE GLASS TORCH DIAMONDS RAINBOW FIREWORKS ANGLERFISH AA BATTERY THE HUMAN EYE LAMP FIREFLY REFLECTOR JACKETS COUNTRY MUSIC LIGHT BULB SPARKLERS THE MOON LIGHTNING THE SUN STARS BICYCLE REFLECTORS SNOW COMPUTER SCREEN THUNDER PLATINUM EAR RINGS