Chapter 22 Physics A First Course Light and Optics.

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Presentation transcript:

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

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

Light and Energy

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

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

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

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

Chapter 22.2 Objectives and Vocabulary 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. additive color process additive primary colors

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

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

How we see colors 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.

Chapter 22.3 Objectives and Vocabulary 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. subtractive color process subtractive primary colors CMYK color process RGB color process

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

Plants use color 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.

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

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.