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LIGHT AND COLOUR

CHAPTER 11. LIGHT AND COLOUR. CHAPTER 11 KEY CONCEPTS. Visible Light is a part of the electromagnetic spectrum. Luminous objects produce light; non-luminous objects do not. The additive colour theory applies to colours of light.

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LIGHT AND COLOUR

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  1. CHAPTER 11 LIGHT AND COLOUR

  2. CHAPTER 11 KEY CONCEPTS • Visible Light is a part of the electromagnetic spectrum. • Luminous objects produce light; non-luminous objects do not. • The additive colour theory applies to colours of light. • The subtractive colour theory applies to colours of non-luminous objects • A light filter absorbs certain colours of light and transmits others. • Many technologies use light and colour.

  3. 11.1 – WHAT IS LIGHT? • Light is a form of energy and can be converted in to electrical energy. • Light travels very fast (300, 000, 000 meters per second) and in a straight line • Light shows wave-like characteristics • Light is transferred through radiation (transfer of electromagnetic energy through matter or space) • Visible light is a mixture of red, orange, yellow, green, blue, indigo, and violet light. ROY. G. BIV

  4. ELECTROMAGNETIC SPECTRUM • Electromagnetic (EM) Spectrum – the classification of EM waves, arranged from lowest energy to highest energy. • Shorter wavelengths have higher energy. • The EM spectrum includes radio waves, microwaves, infrared light, visible light, ultraviolet light, X-Rays, and Gamma Rays

  5. USES OF ELECTROMAGNETIC WAVES • RADIO WAVES – AM/FM radio, TV signals, cell phone communication • MICROWAVES – microwave ovens, telecommunications • INFRARED LIGHT – lasers, remote controls, food lamps, heat lamps • VISIBLE LIGHT – human vision, rainbows, theatre/concert lighting

  6. USES OF ELECTROMAGNETIC WAVES • ULTRAVIOLET LIGHT – “black” light, causes skin to burn or tan, stimulates production of Vitamin D, tanning booths • X-RAYS – medical imaging, security equipment, cancer treatment • GAMMA RAYS – cancer treatment, product of some nuclear decay/waste

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