Light Waves. Today s Topics Color Addition - Light Color Subtraction Pigment Color of water Color of the Sky

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1 Light Waves Today s Topics Color Addition - Light Color Subtraction Pigment Color of water Color of the Sky

2 Additive Color

3 Which of the following is NOT a primary color of light Blue Yellow Red Green

4 Which of the following is NOT a primary color of light Blue Yellow Red Green

5 What color is produced when red light is added to green light? Magenta Cyan Yellow white

6 What color is produced when red light is added to green light? Magenta Cyan Yellow white

7 Which of the following color combinations will produce magenta light Red and blue Green and red Blue and green Red and white

8 Which of the following color combinations will produce magenta light Red and blue Green and red Blue and green Red and white

9 Which of the following color combinations will produce cyan light Red and blue Green and red Blue and green Red and white

10 Which of the following color combinations will produce cyan light Red and blue Green and red Blue and green Red and white

11 Which color do you need to mix with cyan to produce white light? Red Blue Green yellow

12 Which color do you need to mix with cyan to produce white light? Red Blue Green yellow

13 Complimentary Colors These are two colors when mixed, produce white light The compliment to cyan is red The compliment to magenta is green The compliment to yellow is blue

14 Summary Mixing all the colors of LIGHT give us what color?

15 Summary Mixing all the colors of LIGHT give us what color? WHITE LIGHT

16 The theory of color The reason why we see things is that light goes from the object to our eyes

17 The theory of color The reason why we see things is that light goes from the object to our eyes The color we see is due to absorption and reflection

18 The theory of color The reason why we see things is that light goes from the object to our eyes The color we see is due to absorption and reflection White light is made up of the full ROYGBIV

19 Theory of Color Newton discovered that white light split apart gives us the ROYGBIV by accident

20 Why do we see something blue in white light?

21 Why do we see something blue in white light? The object absorbs all the colors except blue, it reflects blue to our eyes

22 Why does a white shirt appear white in white light?

23 Why does a white shirt appear white in white light? It reflects all colors and absorbs none. This is why white is a summer color, to help keep you cool by not absorbing the suns rays.

24 What color would a white shirt appear if we only shined red light on it?

25 What color would a white shirt appear if we only shined red light on it? It would appear RED. White reflects all colors. Think about your screens!

26 What color would a RED shirt appear if we only shine RED light on it?

27 What color would a RED shirt appear if we only shine RED light on it? RED A red shirt reflect RED light!

28 Subtractive Color

29 When all frequencies of light are absorbed, what color results? Black White Cyan Red

30 When all frequencies of light are absorbed, what color results? Black White Cyan Red

31 Which color is produced when yellow & cyan paint are mixed? Blue Red Green Black Blue & Green Green & Red

32 Which color is produced when yellow & cyan paint are mixed? Blue Red Green Black

33 Which color is produced when yellow & magenta paint are mixed? Blue Red Green Black Green & Red Red & Blue

34 Which color is produced when yellow & magenta paint are mixed? Blue Red Green Black

35 Which color is produced when cyan & magenta paint is mixed? Blue Red Green Black Green & Blue Blue & Red

36 Which color is produced when cyan and magenta paint are mixed? Blue Red Green Black

37 What two pigments can you combine to produce the color black? Cyan & magenta Magenta & yellow Green & magenta Cyan & yellow

38 What two pigments can you combine to produce the color black? Cyan & magenta Magenta & yellow Green & magenta Cyan & yellow

39 Why does a black shirt appear black in white light?

40 Why does a black shirt appear black in white light? It absorbs all colors and reflects none. This is why dark colors are for winter times so it can help keep you warm by absorbing the suns rays.

41 What color would a blue shirt appear if we ONLY shined red light on it?

42 What color would a blue shirt appear if we ONLY shined red light on it? BLACK A blue shirt absorbs ALL of the colors (including RED) and only reflects blue. If we only shine red light on it, it will absorb all the light incident on it and will appear black!

43 What would you see if we only shined red light on this picture? What color would the blue writing appear?

44 What color would a blue shirt appear if we only shined red light on it? Black!

45 What about if we only shine blue light? What color will the red appear?

46 What about if we only shine blue light? What color will the red appear?

47 Why do large bodies of water appear bluish-green?

48 Why do large bodies of water appear bluish-green? Red light gets absorbed first (actually in the first 10 m) and you see what is left (blue and green) Cyan.

49 Why is the sky blue?

50 Why is the sky blue? It cannot be because the sky reflects from the water. If it did, what color would the sky be over large bodies of land? (brown/green )

51 Why is the sky blue? It cannot be because the sky absorbs all colors except blue, it reflects blue. How would we be able to see all the different colors outside if this were the case?

52 Why is the sky blue? It must be a different phenomenon. It is called SCATTERING. The small particles are resonating and giving off high frequencies of light (blue/violet)

53 Why does the sun appear yellow, when it is actually white light?

54 Why does the sun appear yellow, when it is actually white light? Since the sky is blue, what color do you get when you subtract blue from white? Yellow (compliment)

55 Why are nice clouds white, while mean storm clouds are dark?

56 Why are nice clouds white, while mean storm clouds are dark? The nice clouds are made of all different sized particles which scatter all colors of light (white)

57 Why are nice clouds white, while mean storm clouds are dark? The nice clouds are made of all different sized particles which scatter all colors of light (white) Storm clouds are filled with water which absorb light. What color do things appear if light is being absorbed?...dark!

58 Why are sunsets red?

59 Why are sunsets red? The sun is at such an angle, that the suns rays are traveling a longer distance through out atmosphere scattering all the blue range light and we view what is left after all the blue energy is used up.

60 Purple Skies?!? After sunset, the reddened evening sunlight illuminates small particles in higher altitudes (10 km to 20 km) in the lower stratosphere. This reddish light combines with blue scattered light to provide a purplish hue.

61 Light is very cool Can you dig it?

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