Physics A First Course Light and Optics Chapter 23 Light and Optics Optics 23.1 23.2 23.3 Optics and Reflection Refraction Mirrors, Lenses, and Images Chapter 23.1 Objectives and Vocabulary Describe how simple optical devices work. Learn the difference between converging and diverging lenses Understand how light is affected by matter. Learn about the law of reflection. optics light ray converging lens diverging lens prism transparent translucent specular reflection diffuse reflection incident ray normal line reflected ray law of reflection ray diagram Simple Optical Devices mirrors prisms lenses — corrective — magnifying Four ways light is affected by matter: Review Reflection and Refraction Reflection occurs when light bounces off a surface. Refraction occurs when light bends crossing through materials. Law of Reflection The incident ray strikes the mirror. The reflected ray bounces off. The angle of incidence equals the angle of reflection. 23A Investigation: Optics Key Question: How are images created by lenses and mirrors? *Students read text section 23.1 AFTER Investigation 23A 23A Investigation Topics View images with lenses. Project images with lenses. Find the magnification of a lens. Chapter 23.2 Objectives and Vocabulary Describe what happens when light goes from one material into another. Understand the index of refraction. Learn about total internal reflection and fiber optics. Learn how different colors of light are refracted. index of refraction angle of reflection total internal reflection critical angle fiber optics dispersion Refraction and colors of light Rainbows are formed when refracted light passes through water droplets. 23B Investigation: Optics and Images Key Question: How are images formed by light? *Students read text section 23.3 AFTER Investigation 23B 23B Investigation Topics Draw a ray diagram. Determine the focal point of a lens. Measure focal length. Chapter 23.3 Objectives and Vocabulary Learn how images form. Learn the difference between a real and virtual image. Learn the parts of a ray diagram and how to draw one. object image virtual image optical axis vocal point focal length real image focus magnification refracting telescope Function of the pupil The pupil gets smaller blocking more of the lens in bright light. Covering part of the lens reduces the amount of light allowed in and but doesn't alter the image seen.