## Light and Color - Detailed Help

### Assignment LC4: Complementary Colors of Light

Objectives:
• The student should be able to explain the significance of complementary colors of light and identify sets of complementary colors.
• The student should be able to use complementary colors and principles of color subtraction to explain the appearance of an object when viewed under white light.

The Physics Classroom, Light and Color Unit, Lesson 2, Part d

 In physics, complementary colors of light are combinations of light colors which ____. Definition of Complementary Colors: Complementary colors of light are combinations of two light colors which can be mixed together in equal intensities to produce white light. Many students of physics have seen a diagram similar to the one shown at the right. The diagram depicts three circles colored with the primary colors of light - red, green and blue. The primary colored circles overlap to produce other colors of light - known as the secondary colors of light: cyan, magenta and yellow. Complementary pairs of light colors are those colors which are exactly opposite each other on the diagram: red and cyan, magenta and green, and blue and yellow.

 The complementary color of red light is ____ light. Definition of Complementary Colors: Complementary colors of light are combinations of two light colors which can be mixed together in equal intensities to produce white light. Many students of physics have seen a diagram similar to the one shown at the right. The diagram depicts three circles colored with the primary colors of light - red, green and blue. The primary colored circles overlap to produce other colors of light - known as the secondary colors of light: cyan, magenta and yellow. Complementary pairs of light colors are those colors which are exactly opposite each other on the diagram: red and cyan, magenta and green, and blue and yellow.

 The complementary color of green light is ____ light. Definition of Complementary Colors: Complementary colors of light are combinations of two light colors which can be mixed together in equal intensities to produce white light. Many students of physics have seen a diagram similar to the one shown at the right. The diagram depicts three circles colored with the primary colors of light - red, green and blue. The primary colored circles overlap to produce other colors of light - known as the secondary colors of light: cyan, magenta and yellow. Complementary pairs of light colors are those colors which are exactly opposite each other on the diagram: red and cyan, magenta and green, and blue and yellow.

 The complementary color of blue light is ____ light. Definition of Complementary Colors: Complementary colors of light are combinations of two light colors which can be mixed together in equal intensities to produce white light. Many students of physics have seen a diagram similar to the one shown at the right. The diagram depicts three circles colored with the primary colors of light - red, green and blue. The primary colored circles overlap to produce other colors of light - known as the secondary colors of light: cyan, magenta and yellow. Complementary pairs of light colors are those colors which are exactly opposite each other on the diagram: red and cyan, magenta and green, and blue and yellow.

 Three colored spotlights - red, green and blue - with equal intensities are used to shine white light upon a red shirt. The shirt appears red because it absorbs the ____ light and reflects the ____ light. Many students of physics have seen a diagram similar to the one shown at the right. The diagram depicts three circles colored with the primary colors of light - red, green and blue. The primary colored circles overlap to produce other colors of light - known as the secondary colors of light: cyan, magenta and yellow. Complementary pairs of light colors are those colors which are exactly opposite each other on the diagram: red and cyan, magenta and green, and blue and yellow. Color Subtraction and Complementary Colors: An object which is observed to be a specific color when illuminated with white light has absorbed the complementary color of the observed color. In effect, white light or R+ G + B was incident on the object, one or more of the components of white light was absorbed or subtracted and the remains were reflected to the observer's eye. The color of a shirt is not in the shirt itself, but rather in the light which the shirt reflects. If red, green and blue light shine on a shirt and the shirt appears red, then only the red light of red, green and blue incident light was reflected. So if only the red was reflected, then what happened to the green and blue light? It was subtracted or absorbed. So green and blue light - also known as cyan light - are absorbed by a shirt which looks red. Now think about the color wheel shown in the Dig That Diagram section above and you will see the big idea. Cyan light - the complement of red light - is absorbed when a shirt appears red in the presence of white light.

 Three colored spotlights - red, green and blue - with equal intensities are used to shine white light upon a green shirt. The shirt appears green because it absorbs the ____ light and reflects the ____ light. Many students of physics have seen a diagram similar to the one shown at the right. The diagram depicts three circles colored with the primary colors of light - red, green and blue. The primary colored circles overlap to produce other colors of light - known as the secondary colors of light: cyan, magenta and yellow. Complementary pairs of light colors are those colors which are exactly opposite each other on the diagram: red and cyan, magenta and green, and blue and yellow. Color Subtraction and Complementary Colors: An object which is observed to be a specific color when illuminated with white light has absorbed the complementary color of the observed color. White light or R+ G + B was incident on the object. One or more of the components of white light were absorbed or subtracted and the remaining light colors were reflected to the observer's eye. The color of a shirt is not in the shirt itself, but rather in the light which the shirt reflects. If red, green and blue light shine on a shirt and the shirt appears green, then only the green light of red, green and blue incident light was reflected. So if only the green was reflected, then what happened to the red and blue light? It was subtracted or absorbed. So red and blue light - also known as magenta light - are absorbed by a shirt which looks green. Now think about the color wheel shown in the Dig That Diagram section above and you will see the big idea. Magenta light - the complement of green light - is absorbed when a shirt appears green in the presence of white light.

 Three colored spotlights - red, green and blue - with equal intensities are used to shine white light upon a blue shirt. The shirt appears blue because it absorbs the ____ light and reflects the ____ light. Many students of physics have seen a diagram similar to the one shown at the right. The diagram depicts three circles colored with the primary colors of light - red, green and blue. The primary colored circles overlap to produce other colors of light - known as the secondary colors of light: cyan, magenta and yellow. Complementary pairs of light colors are those colors which are exactly opposite each other on the diagram: red and cyan, magenta and green, and blue and yellow. Color Subtraction and Complementary Colors: An object which is observed to be a specific color when illuminated with white light has absorbed the complementary color of the observed color. White light or R+ G + B was incident on the object. One or more of the components of white light were absorbed or subtracted and the remaining light colors were reflected to the observer's eye. The color of a shirt is not in the shirt itself, but rather in the light which the shirt reflects. If red, green and blue light shine on a shirt and the shirt appears blue, then only the blue light of red, green and blue incident light was reflected. So if only the blue was reflected, then what happened to the red and green light? It was subtracted or absorbed. So red and green light - also known as yellow light - are absorbed by a shirt which looks blue. Now think about the color wheel shown in the Dig That Diagram section above and you will see the big idea. Yellow light - the complement of blue light - is absorbed when a shirt appears blue in the presence of white light.

 Three colored spotlights - red, green and blue - with equal intensities are used to shine white light upon a cyan shirt. The shirt appears cyan because it absorbs the ____ light and reflects the ____ light. Many students of physics have seen a diagram similar to the one shown at the right. The diagram depicts three circles colored with the primary colors of light - red, green and blue. The primary colored circles overlap to produce other colors of light - known as the secondary colors of light: cyan, magenta and yellow. Complementary pairs of light colors are those colors which are exactly opposite each other on the diagram: red and cyan, magenta and green, and blue and yellow. Color Subtraction and Complementary Colors: An object which is observed to be a specific color when illuminated with white light has absorbed the complementary color of the observed color. White light or R+ G + B was incident on the object. One or more of the components of white light were absorbed or subtracted and the remaining light colors were reflected to the observer's eye. The color of a shirt is not in the shirt itself, but rather in the light which the shirt reflects. If red, green and blue light shine on a shirt and the shirt appears cyan, then the green and blue light of red, green and blue incident light was reflected. After all, cyan light can be thought of as equivalent to blue and green. So if the green and blue was reflected, then what happened to the red light? It was subtracted or absorbed. So red is absorbed by a shirt which looks cyan. Now think about the color wheel shown in the Dig That Diagram section above and you will see the big idea. Red light - the complement of cyan light - is absorbed when a shirt appears cyan in the presence of white light.

 Three colored spotlights - red, green and blue - with equal intensities are used to shine white light upon a magenta shirt. The shirt appears magenta because it absorbs the ____ light and reflects the ____ light. Many students of physics have seen a diagram similar to the one shown at the right. The diagram depicts three circles colored with the primary colors of light - red, green and blue. The primary colored circles overlap to produce other colors of light - known as the secondary colors of light: cyan, magenta and yellow. Complementary pairs of light colors are those colors which are exactly opposite each other on the diagram: red and cyan, magenta and green, and blue and yellow. Color Subtraction and Complementary Colors: An object which is observed to be a specific color when illuminated with white light has absorbed the complementary color of the observed color. White light or R+ G + B was incident on the object. One or more of the components of white light were absorbed or subtracted and the remaining light colors were reflected to the observer's eye. The color of a shirt is not in the shirt itself, but rather in the light which the shirt reflects. If red, green and blue light shine on a shirt and the shirt appears magenta, then the red and blue light of red, green and blue incident light was reflected. After all, magenta light can be thought of as equivalent to red and blue. So if the red and blue was reflected, then what happened to the green light? It was subtracted or absorbed. So green is absorbed by a shirt which looks magenta. Now think about the color wheel shown in the Dig That Diagram section above and you will see the big idea. Green light - the complement of magenta light - is absorbed when a shirt appears magenta in the presence of white light.

 Three colored spotlights - red, green and blue - with equal intensities are used to shine white light upon a yellow shirt. The shirt appears yellow because it absorbs the ____ light and reflects the ____ light. Many students of physics have seen a diagram similar to the one shown at the right. The diagram depicts three circles colored with the primary colors of light - red, green and blue. The primary colored circles overlap to produce other colors of light - known as the secondary colors of light: cyan, magenta and yellow. Complementary pairs of light colors are those colors which are exactly opposite each other on the diagram: red and cyan, magenta and green, and blue and yellow. Color Subtraction and Complementary Colors: An object which is observed to be a specific color when illuminated with white light has absorbed the complementary color of the observed color. White light or R+ G + B was incident on the object. One or more of the components of white light were absorbed or subtracted and the remaining light colors were reflected to the observer's eye. The color of a shirt is not in the shirt itself, but rather in the light which the shirt reflects. If red, green and blue light shine on a shirt and the shirt appears yellow, then the red and green light of red, green and blue incident light was reflected. After all, yellow light can be thought of as equivalent to red and green. So if the red and green was reflected, then what happened to the blue light? It was subtracted or absorbed. So blue is absorbed by a shirt which looks yellow. Now think about the color wheel shown in the Dig That Diagram section above and you will see the big idea. Blue light - the complement of yellow light - is absorbed when a shirt appears yellow in the presence of white light.