What gives an object its color?

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Suzan Caldwell
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1 Lesson What gives an object its color?!,., ~, 'i 83

2 LESSON 14 What gives an object its color? Joan's dress is red. Tornis wearing a blue shirt. Grass is green. An orange is of course... orange. Color, color, everywhere! Look around. How many colors do you see? What causes color in the objects we see? Youhave learned that when light strikes an object, it can be reflected, absorbed, or transmitted. The color we see depends upon whether the object is opaque or transparent. The color also depends upon how much of the light is reflected, absorbed, or transmitted. OPAQUE OBJECTS The color of an opaque object is the color that it reflects. For example, a red object reflects only red light. It absorbs all other colors. A green object reflects only green light. It absorbs all other colors. What about white and black objects? A white object reflects all the colors that make up white light. A black object, on the other hand, absorbs all the colors that strike it. No color is reflected. Most objects reflect more than one color. The colors combine. We see them as mixtures of colors, like blue-green and red-orange. TRANSPARENT OBJECTS The color of a transparent (or translucent) object is the color that passes through the object. For example, red glass transmits only red light. It absorbs all other colors. Blue glass transmits only blue light. It absorbs all other colors. Ordinary window glass transmits all colors. White light that has passed through window glass still has all the colors of white light. None of the colors have been absorbed by the glass. You have learned that some transparent substances transmit only some colors. All other colors are blocked. These substances are called filters. Filters are often used in spotlights and in photography. 84

3 OBJECTS AND THEIR COLORS Study Figures A through E. Answer the questions with each. OPAQUE OBJECTS 1. List the colors that are striking the object in Figure A. ; -=-~ 2. Together, these colors make up what kind of light? ROY G B I V ROY G B I V 3. List the colors that are being reflected. ~~~ 4. Together these colors make up what kind of light? Figure A 5. The color of an opaque object is the color that the object reflects, absorbs, transmits 6. What color is the object in Figure A? 7. How do you know? -'- ---''-- ROY G B I V 8. List the colors that are striking the object in Figure B. -'='- 9. All the colors are being reflected, absorbed 10. None of the colors are being Figure B reflected, absorbed 11. The color of an opaque object is the color that the object reflects, absorbs, transmits 12. What color is the object in Figure B? 13. How do you know? 85

4 14. List the colors that are striking the object in Figure C. ;--"''------"'---'-'"'--..:. ROY G 8 I V 15. List the colors that are being absorbed. -=..: '><.--'~-'J~ 16. Which color is being reflected? 17. What gives an opaque object its Figure C color? What is the color of the object in Figure C? Why? ~ TRANSPARENT OBJECTS 19. List the colors that are striking the glass in Figure D. --'-"---'-'...<.- ---"0"-----' R o Y G 8 I V Figure D r--? Which of these colors is being absorbed? ~-= -' 21. Which color is being transmitted? 22. The color of a transparent object is the color it reflects, absorbs, transmits 23. What is the color of the glass in Figure D? --'- Why? ~ 86

5 24. What is the definition of a filter? I " 25. Is this glass a filter? ~ ""'I Why? ~~ r. White light is striking the glass in Figure E. -? 26. Are any colors being absorbed? R o y G B v 27. All the colors are being reflected, transmitted 28. What kind of light is leaving the glass? '--- Figure E 29. Is this glass a filter? Why? ~ 30. Does this glass have a color? 31. What kind of glass is this? 32. Where can it be found? REACHING OUT The colors of the American flag are red, white, and blue. blue What color or colors does each of these colors reflect? 1. Red 2. White 3. Blue Figure F 87

6 FILL IN THE BLANK Complete each statement using a term or terms from the list below. Write your answers in the spaces provided. Some words may be used more than once. green filter absorbs reflects all red opaque transparent does not transmits 1. An object that does not allow light to pass through it is said to be...~ 2. An object that does allow light to pass through it is said to be --'- 3. The color of an opaque object is the color it 4. A white object reflects the colors that make up white light. 5. A black object reflect light. A black object all the light that strikes it. 6. A green sweater absorbs all colors except ~ 7. The color of a transparent object is the color it 8. Window glass transmits the colors that strike it. 9. A red glass transmits only the color. It other colors. 10. A substance that transmits some colors and blocks others is called a all 88

Hot Sync. Materials Needed Today

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