Light is part of the electromagnetic spectrum and travels in waves
<ul><li>Lesson #6, Section 3.3-3.4. Pages 221-229 </li></ul><ul><li>Learner Outcomes </li></ul><ul><li>I can evaluate, com...
<ul><li>ROY-G-BIV </li></ul>
<ul><li>Radiation  is the wave like transfer of light from its source in all directions.  </li></ul><ul><li>Light is often...
<ul><li>Light is a form of energy  When light reaches a surface, it can be absorbed and transformed into other types of en...
<ul><li>The amount of energy a surface receives depends on the intensity of the light.  </li></ul><ul><li>The more intense...
<ul><li>NATURAL LIGHT SOURCE </li></ul><ul><li>ARTIFICIAL LIGHT SOURCE  </li></ul><ul><li>Sun </li></ul><ul><li>Nuclear Fu...
<ul><li>NATURAL LIGHT SOURCE  </li></ul><ul><li>ARTIFICIAL LIGHT SOURCE  </li></ul><ul><li>Candles  or Oil  Lamps </li></u...
<ul><li>NATURAL LIGHT SOURCE  </li></ul><ul><li>ARTIFICIAL LIGHT SOURCE </li></ul><ul><li>Wood  (fire) </li></ul><ul><li>C...
<ul><li>NATURAL LIGHT SOURCE  </li></ul><ul><li>ARTIFICIAL LIGHT SOURCES  </li></ul><ul><li>Bioluminescence  (light produc...
<ul><li>Incandescent  light bulbs produce far more heat than light, or more infrared radiation than visible light energy. ...
<ul><li>Read page  224  and complete this activity in groups of  3-5  people </li></ul><ul><li>Make sure you observe safet...
<ul><li>... evaluate, compare, and contrast different artificial and natural light sources? </li></ul>
<ul><li>#1. Explain how an incandescent light bulb works. ________________________________________________________________...
<ul><li>#3. Why would a business choose fluorescent instead of incandescent lights?  _____________________________________...
<ul><li>The various colors of the  visible spectrum  have slightly different wavelengths and  refract  by a slightly diffe...
<ul><li>The  Primary  colors of the visible spectrum are  red ,  green  and  blue . </li></ul><ul><li>Secondary  colors ar...
 
<ul><li>Television puts the theory of color addition into practice.  </li></ul><ul><li>By changing the  brightness  of the...
<ul><li>The colour an object appears depends on the colours of light it reflects. </li></ul>For example, a red book only r...
A white hat would reflect all seven colours: A pair of purple trousers would reflect purple light ( and red and blue, as p...
<ul><li>If we look at a coloured object in coloured light we see something different </li></ul>White light Shorts look blu...
<ul><li>Filters can be used to “block” out different colours of light: </li></ul>Red Filter Magenta Filter
<ul><li>... describe how primary colours can be added to produce different colours and white light? </li></ul>
<ul><li>#1. What are the primary colours of light?  How is white light produced? _________________________________________...
<ul><li>#3. You are a lighting technician in a theatre.  The director asks for magenta light on stage, but you only have r...
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Science8 Unit C Lightand Optics Section3 Lesson6 Visible Light

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Additive Colour Theory
Artificial Sources of Light
Natural Sources of Light
Visible Light
Colour Filters

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Science8 Unit C Lightand Optics Section3 Lesson6 Visible Light

  1. 1. Light is part of the electromagnetic spectrum and travels in waves
  2. 2. <ul><li>Lesson #6, Section 3.3-3.4. Pages 221-229 </li></ul><ul><li>Learner Outcomes </li></ul><ul><li>I can evaluate, compare, and contrast different artificial and natural light sources </li></ul><ul><li>I can describe how primary colours can be added to produce different colours and white light </li></ul>
  3. 3. <ul><li>ROY-G-BIV </li></ul>
  4. 4. <ul><li>Radiation is the wave like transfer of light from its source in all directions. </li></ul><ul><li>Light is often called radiant energy . </li></ul><ul><li>Light from the sun is formed by nuclear fusion . </li></ul>
  5. 5. <ul><li>Light is a form of energy When light reaches a surface, it can be absorbed and transformed into other types of energy. </li></ul><ul><li>… into electrical energy </li></ul><ul><li>… into thermal energy </li></ul><ul><li>… into chemical energy </li></ul>
  6. 6. <ul><li>The amount of energy a surface receives depends on the intensity of the light. </li></ul><ul><li>The more intense the light, the more light can be absorbed. </li></ul>
  7. 7. <ul><li>NATURAL LIGHT SOURCE </li></ul><ul><li>ARTIFICIAL LIGHT SOURCE </li></ul><ul><li>Sun </li></ul><ul><li>Nuclear Fusion  Thermal Energy  Visible Light Energy </li></ul><ul><li>Incandescent (heat causing a filament of metal to glow - visible light) </li></ul><ul><li>Electrical energy  Thermal energy  Visible light energy </li></ul>
  8. 8. <ul><li>NATURAL LIGHT SOURCE </li></ul><ul><li>ARTIFICIAL LIGHT SOURCE </li></ul><ul><li>Candles or Oil Lamps </li></ul><ul><li>Chemical energy  Thermal Energy  Visible light energy </li></ul><ul><li>Florescent (ultraviolet light is absorbed by fabric particles, which in turn emit some of the energy as light - glowing) </li></ul><ul><li>Ultraviolet light  Energy absorbed  Visible light energy/particles energy </li></ul>
  9. 9. <ul><li>NATURAL LIGHT SOURCE </li></ul><ul><li>ARTIFICIAL LIGHT SOURCE </li></ul><ul><li>Wood (fire) </li></ul><ul><li>Chemical energy  Thermal Energy  Visible light energy </li></ul><ul><li>Phosphorescent (light energy is stored and released later as visible light) paint </li></ul><ul><li>Chemical energy  Visible light energy </li></ul>
  10. 10. <ul><li>NATURAL LIGHT SOURCE </li></ul><ul><li>ARTIFICIAL LIGHT SOURCES </li></ul><ul><li>Bioluminescence (light produced by living organisms) </li></ul><ul><li>Chemical energy  Visible light energy </li></ul><ul><li>Chemiluminescent (light energy released by chemical reactions) glow sticks </li></ul><ul><li>Chemiluminescence </li></ul><ul><li>Movies (Shockwave/Flash) </li></ul><ul><li>Chemical energy  Visible light energy </li></ul>
  11. 11. <ul><li>Incandescent light bulbs produce far more heat than light, or more infrared radiation than visible light energy. 95% heat vs. 5% light </li></ul><ul><li>Fluorescent bulbs are more efficient. 80% heat vs. 20% light </li></ul>
  12. 12. <ul><li>Read page 224 and complete this activity in groups of 3-5 people </li></ul><ul><li>Make sure you observe safety protocols </li></ul>
  13. 13. <ul><li>... evaluate, compare, and contrast different artificial and natural light sources? </li></ul>
  14. 14. <ul><li>#1. Explain how an incandescent light bulb works. ____________________________________________________________________________________ </li></ul><ul><li>#2. Your watch dial may have glow in the dark numbers. Is this phosphorescence or fluorescence? Explain your answer. ________________________________________________________________________________________________________________________________________________________________________ </li></ul>
  15. 15. <ul><li>#3. Why would a business choose fluorescent instead of incandescent lights? ____________________________________________________________________________________ </li></ul><ul><li>#4. What is bioluminescence? Provide at least two examples. ______________________________________________________________________________________________________________________________ </li></ul>
  16. 16. <ul><li>The various colors of the visible spectrum have slightly different wavelengths and refract by a slightly different amount. </li></ul><ul><li>The Primary colors of the visible spectrum are red , green and blue . </li></ul>
  17. 17. <ul><li>The Primary colors of the visible spectrum are red , green and blue . </li></ul><ul><li>Secondary colors are cyan , magenta and yellow . </li></ul><ul><li>The mixing of three colors of light to produce many different colors of light is called the theory of color addition. </li></ul>
  18. 19. <ul><li>Television puts the theory of color addition into practice. </li></ul><ul><li>By changing the brightness of the dots that make up the screen many different colors can be produced. </li></ul><ul><li>The television works by fooling the eye into seeing colors that are not really there. </li></ul>
  19. 20. <ul><li>The colour an object appears depends on the colours of light it reflects. </li></ul>For example, a red book only reflects red light: White light Only red light is reflected Homework
  20. 21. A white hat would reflect all seven colours: A pair of purple trousers would reflect purple light ( and red and blue, as purple is made up of red and blue): Purple light White light
  21. 22. <ul><li>If we look at a coloured object in coloured light we see something different </li></ul>White light Shorts look blue Shirt looks red
  22. 23. <ul><li>Filters can be used to “block” out different colours of light: </li></ul>Red Filter Magenta Filter
  23. 24. <ul><li>... describe how primary colours can be added to produce different colours and white light? </li></ul>
  24. 25. <ul><li>#1. What are the primary colours of light? How is white light produced? ________________________________________________________________________________________________________________________ </li></ul><ul><li>#2. Explain how a prism can determine what white light is composed of? ________________________________________________________________________________ </li></ul>
  25. 26. <ul><li>#3. You are a lighting technician in a theatre. The director asks for magenta light on stage, but you only have red, blue, and green lights. What could you do to produce magenta light? ________________________________________________________________________________________________________________________________________________________________________________________________________ </li></ul>

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