Optics Light Overview of light Properties of light

Optics Light - Overview of light - Properties of light - Luminous and non-luminous objects - History of light - The electromagnetic spectrum - Prisms - Colour

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Where does light come from? The SUN!! • The sun is a star located __________________________________, away from Earth. • It provides energy in the form of light through a process called nuclear fusion. • Nuclear fusion occurs when two atoms that naturally repelled each other ____________ • __________

• The sun provides the energy that enables life on Earth.

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• Light travels VERY FAST – 3. 0 X 108 m/s = 300, 000 kilometres per second. At this speed it can. . . . . ______

The Strangeness of Light • The speed of light (c) is constant • Nothing moves faster than the speed of light • Anything with mass cannot travel at the speed of light • …………….

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• Light travels ___________than sound. For example: 1) Thunder and lightning start at. . . 2) When a. . . .

• We see things. . . : Homework

Luminous and non-luminous objects A ______object is one that produces light. A ______ object is one that reflects light.

Fun Science Light Video

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Properties of Light summary 1) Light travels. . . . 2) Light travels ______ 3) We see things because. . . . 4). . . .

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Modern electromagnetic waves • Today we …………………. . _______

Modern View Continued As we _______

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The Surprising Universe • Today Scientists use different portions of the electromagnetic spectrum to collect and analyze data about _______ • This provides them with completely different views compared with using visible light only

The Surprising Universe

Essential Knowledge, Skills, and Processes • Analyze the …………………. _______

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The colours of the rainbow: • Red • Orange • Yellow • Green • Blue • Indigo • Violet

Prisms • What happens when you place two prisms next to each other? Simulation Removed

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Adding colours • White light can be split up to make separate colours. These colours can be added together again. • The primary colours of light are __________ : Adding blue and red makes magenta (purple) Adding red and green makes yellow Adding blue and green makes cyan (light blue) Adding all three makes white again

Seeing colour • The colour an object appears _______ For example, a red book __________ White light Only red light is reflected

. . . . Purple light A white hat would reflect __________ White light

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• In different colours of light this uniform would look different: Red light Shirt looks red, why? Shorts look black, why? Blue Shirt looks black, why? light Shorts look blue, why?

Using filters • Filters can be used to “______” out different colours of light: Red Filter Magenta Filter

Colour Blindness • The tricky thing about colour blindness is. . . • (40% of. . . .

How many animals are there?

• Blue Colour Blindness. . . • In both these cases. . .

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