Chapter 14: Light Section 4: Using Light

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Chapter 14: Light Section 4: Using Light Polarized light: light waves vibrate in only one direction after passing through a polarizing filter

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Holography: process used to create a three-dimensional photographic image of an object 1. Illuminating objects with laser light produces holograms. 2. Holographic images are difficult to copy

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When laser light must travel long distances or to hard-to-reach places, optical fibers are used. Total internal reflection: light strikes a surface between two materials and is completely reflected back to the first material

http://www. optics. arizona http://www.optics.arizona.edu/Nofziger/OPTI%20200/Pictures/optical-fiber-basics.jpg

http://i. cnn. net/cnn/SPECIALS/2004/explorers/images/profiles/top/top http://i.cnn.net/cnn/SPECIALS/2004/explorers/images/profiles/top/top.fiber.optics.jpg

2. Uses of optical fibers Communication: send enormous numbers of messages in coded light beams Medicine: internally explore the body

D. Optical scanners: read intensities of reflected light and convert the information to digital signals. 1. Used in stores to read price on pattern called a bar code 2. Used in U.S. Postal Service to sort mail and keep track of deliveries 3. Used in photocopy machines and fax machines

http://www.seeingwithsound.com/ocr.htm

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