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Chapter 22

Chapter 22. Physics A First Course. Light and Optics. Light and Optics Light and Color. 22.1 Properties of Light 22.2 Vision and Color 22.3 Using Color. Describe the properties of light. Review the term light intensity. Learn about the speed of light.

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Chapter 22

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  1. Chapter 22 Physics A First Course Light and Optics

  2. Light and OpticsLight and Color • 22.1 Properties of Light • 22.2 Vision and Color • 22.3 Using Color

  3. Describe the properties of light. Review the term light intensity. Learn about the speed of light. Be able to compare light and sound waves. Chapter 22.1 Objectives and Vocabulary • incandescence • fluorescence • intensity

  4. Light and Energy

  5. Incandescent vs. Fluorescent Light Fluorescent bulbs are four times more efficient.

  6. Speed of Sound vs. Speed of Light • Light travels almost a million times faster • Light travels around the earth 7.5 times per second

  7. Key Question: How is color created by light? 22A Investigation: Light and Color *Students read text section 22.2 AFTER Investigation 22A

  8. 22A Investigation Topics • Compare sources of light. • Mix colors of light. • Describe how the human eye sees color. • Explain how printers make colors.

  9. white light photoreceptors cones rods Describe white light and color. Learn how our eyes see light and interpret color. Learn about the additive color process. Learn that light is a wave, but also made of particles called photons. Chapter 22.2 Objectives and Vocabulary • additive color process • additive primary colors

  10. How the human eye sees light • Photoreceptors release chemical signals. • Chemical signals travel to the brain along the optic nerve. optic nerve

  11. Cones respond to three colors: red, green and blue. Rods detect intensity of light: black, white, shades of gray. Photoreceptors in the eye

  12. Which chemical signal gets sent depends on how much energy the light has. If the brain gets a signal from ONLY green cones, we see green. How we see colors

  13. Learn about the subtractive color process. Compare the CMYK and RGB processes. Learn about color blindness. Learn how plants use light and color to grow. Chapter 22.3 Objectives and Vocabulary • subtractive color process • subtractive primary colors • CMYK color process • RGB color process

  14. Normal vision Weak green color vision No red color vision Color Blindness

  15. Plants absorb energy from light and convert it to chemical energy in the form of sugar (food for the plant). Chlorophyll is an important molecule that absorbs blue and red light. Plants use color

  16. Key Question: What is the difference between reflection and refraction? 22B Investigation: Reflection and Refraction *Students read text section 22.3 BEFORE Investigation 22B and text section 23.1 should follow it.

  17. 22B Investigation Topics • Observe the law of reflection. • Draw ray diagrams. • Observe light rays passing through a prism. • Observe refraction and reflection at the same time. • Determine the angle of refraction.

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