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Unformatted text preview: 1 1 Chapter 34 One of the most important uses of the basic laws governing light is the production of images. Images are critical to a variety of fields and industries ranging from entertainment, security, and medicine In this chapter we define and classify images, and then classify several basic ways in which they can be produced. Images 34- 2 A clear sheet of polaroid is placed on top of a similar sheet so that their polarizing axes make an angle of 30 with each other. The ratio of the intensity of emerging light to incident unpolarized light is: A. 1/4 B. 1/3 C. 1/2 D. 3 /4 E. 3 /8 3 Image: a reproduction derived from light Real Image: light rays actually pass through image, really exists in space (or on a screen for example) whether you are looking or not Virtual Image: no light rays actually pass through image. Only appear to be coming from image. Image only exists when rays are traced back to perceived location of source Two Types of Images 34- object lens real image object mirror virtual image 4 Light travels faster through warm air warmer air has smaller index of refraction than colder air refraction of light near hot surfaces For observer in car, light appears to be coming from the road top ahead, but is really coming from sky. A Common Mirage 34- Fig. 34-1 5 Plane mirror is a flat reflecting surface. Plane Mirrors, Point Object 34- Fig. 34-2 Fig. 34-3 Ib Ob = Identical triangles Plane Mirror: i p = - Since I is a virtual image i < 0 6 Each point source of light in the extended object is mapped to a point in the image Plane Mirrors, Extended Object 34- Fig. 34-4 Fig. 34-5 2 7 Your eye traces incoming rays straight back, and cannot know that the rays may have actually been reflected many times Plane Mirrors, Mirror Maze 34- Fig. 34-6 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 8 Plane mirror Concave Mirror 1. Center of Curvature C: in front at infinity in front but closer 2. Field of view wide smaller 3. Image i=p | i|>p 4. Image height4....
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