Lecture 23-24 Ch 34

Lecture 23-24 Ch 34 - PH 222-3A Spring 2007 222 3A Images...

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H 222- A Spring 2007 PH 222 3A Spring 2007 Images Lectures 23-24 Chapter 34 (Halliday/Resnick/Walker, Fundamentals of Physics 8 th edition) 1
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Chapter 34 Images One of the most important uses of the basic laws governing light is the roduction of images Images are critical to a variety of fields and industries production of images. Images are critical to a variety of fields and industries ranging from entertainment, to security, to medicine. this chapter we define and classify images, and then classify several basic In this chapter we define and classify images, and then classify several basic ways in which they can be produced. 2
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Two Types of Images al image object lens real image Image: A reproduction derived from light. object mirror virtual image Real Image: Light rays actually pass through image, really exist in space (or on a screen for example) whether you are looking or not. irtual Image: No light rays actually pass through image Only appear to be 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. 3
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A Common Mirage Light travels faster through warm air warmer air has smaller index of refraction than colder air refraction of light near hot surfaces. or observer in car light appears to be coming from the road top ahead but is For observer in car, light appears to be coming from the road top ahead, but is really coming from the sky. Fig. 34-1 4
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Plane Mirrors, Point Object Plane mirror is a flat reflecting surface. Fig. 34-2 Ob Identical triangles Fig. 34-3 Ib Plane Mirror: ip = − Since I is a virtual image, i < 0. 5
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Plane Mirrors, Extended Object Each point source of light in the extended object is mapped to a point in the image.
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Lecture 23-24 Ch 34 - PH 222-3A Spring 2007 222 3A Images...

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