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Session 3 lecture outline
The document discusses the properties of visible light and color, explaining that visible light is a narrow range of frequencies and wavelengths perceived by the human eye as different colors, with higher frequencies appearing violet/blue and lower frequencies appearing red. It describes how the primary colors of light - red, green and blue - can be combined to create other colors, and how the color an object appears depends on which colors of light it reflects or transmits.
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Session 3 lecture outline
- 2. Module 3is all about visible light how common sources produce visible light, the common properties and characteristics of light, And how the eye sees color
- 3. Focus Objectives Special characteristic of Infer where colors come visible light: Color from Visible light is the Relate color to frequency narrow range of and wavelength frequencies and Explain why objects wavelengths that can be appear in a particular seen by the human eye color The differences of Appreciate proper wavelengths within this lighting in doing various range are perceived as activities. differences in color
- 4. What I alreadyWhat I want to What I learned know about know light •What did you see? • List the colors in order • How does the acronym ROY G BIV help you describe what you see? •Where could thave these colors come from?
- 5. Q1. Whichcolor registers the highest frequency? shortest wavelength? Q2. Which color registers the lowest frequency? longest wavelength? Q3 What pattern do you notice about the wavelength and frequency of the different colors? Q4. When you take the product of wavelength and frequency, what do you get? What is the significance of this value? Q5. What is a possible relationship between wavelength and frequency? How would you prove this relationship? Q6. What can you say about the speed of the different colors of light in air?
- 6. Q1. Which colorregisters the highest frequency? shortest wavelength? Violet has the highest frequency and the shortest wavelength. Q2. Which color registers the lowest frequency? Longest wavelength? Red has the lowest frequency and the longest wavelength. Q3 What pattern do you notice about the wavelength and frequency of the different colors? Long wavelength colors have low frequencies. Q4. What is a possible relationship between wavelength and frequency? How would you prove this relationship? Wavelength and frequency are inversely proportional. This can be proven by finding out whether the product wavelength x frequency would equal a constant. Q5. When you take the product of wavelength and frequency, what do you get? What is the significance of this value? The product of wavelength and its corresponding frequency is very close to 3 x 108m/s, the speed of light in air.
- 7. the visible spectrum Color Wavelength Frequency λ THz(1012 consists of color nm (10-9 m) Hz bands and therefore are red 780 - 622 384 - 482 identified by a range of orange 622 - 597 482 - 503 wavelengths and yellow 597 - 577 503 - 520 frequencies to wit green 577 - 492 520 - 610 blue 492 - 455 610 - 659 violet 455 - 390 659 - 769
- 8. Shine the flashlighton each filter and note the color of light projected on the screen Q1. What is the color of the beam transmitted by the filter? Q2. How does the color of the filter compare to the color it transmitted? Q3. Write a general statement that describes the color of the filter and the color it transmits.
- 9. http://users.halpc.org/~clement/Simulations/Mixing%20Colors/rgbColor.html Primary colorsfor light Primary colors for paint : pigments RED Magenta GREEN Yellow cyan BLUE
- 10. For light For paint pigments Q4. Describe the color of Magenta + yellow = ____ the overlap: Yellow + cyan = ______ Red + blue = ______ Magenta + cyan = ______ Blue + green = ________ Magneta + cyan + yellow Green + red = ________ = __________ Red + Green+ Blue = ____
- 11. http://www.cs.brown.edu/exploratories/freeSoftware/repository/edu/brown/cs/exploratori es/applets/combinedColorMixing/combined_color_mixing_java_plugin.html) 1. Click on the light bulb, paint can, and colored filter icons located in the toolbar on the left side to add them to the lab area. Clicking on an object in the scene removes it from the scene, while clicking on a projector specifies it as the recipient of the next light bulb that is selected. Clicking on the "Animate Beams" button activates the projectors and the user can directly observe how the selected items affect the color of the light beams as they travel through the scene.
- 13. Bulb Filter Paint Color we “see”: Red Red Red Green Blue Magenta Cyan yellow Green Red Green Blue Magenta Cyan yellow Blue Red Green Blue Magenta Cyan yellow
- 14. White light can be split up to make separate colors. These colors can be added together again. The primary colors of light are red, blue and green: Adding blue and red Adding blue and green makes magenta makes cyan (light blue) (purple) Adding red and Adding all three green makes makes white yellow again
- 15. Filters can be used to “block” out different colors of light: Red Filter Magenta Filter
- 16. The color an object appears depends on the colors of light it reflects. For example, a red book only reflects red light: White Only red light is light reflected
- 17. A pair ofpurple trousers would reflect purple light (and red and blue, as purple is made up of red and blue): Purple light A white hat would reflect all seven colours: White light
- 18. If we look at a coloured object in coloured light we see something different. For example, consider a this pair of shirt and shorts: Shirt looks red White light Shorts look blue
- 19. In different colours of light they would look different: Red Shirt looks red light Shorts look black Shirt looks black Blue light Shorts look blue
- 20. For light: For pigments Primary colors: The color of a Red transparent object is the Green color it transmits Blue The color of an opaque material is the color it Red+ blue = magenta reflects Blue + green = cyan Red + blue =yellow Red + blue + green = white
- 21. Evaluate red black red blue black
- 22. green blue green red blue black