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Directions: Read about lasers. Then below, read each pair of statements. Underline the one that
states a valid generalization based on what you read.Reading Comprehension • Saddleback Educational Publishing ©2002 3 Watson, Irvine, CA 92618•Phone (888)SDL-BACK•www.sdlback.com
Lasers
A laser organizes irregular or jumbled light waves into a harmonious stream of light.
The word “laser” is an acronym for Light Amplification by the Stimulated Emission of
Radiation. In 1957, Theodore Maiman developed the idea of a laser based on the
theories of light proposed by the great physicist, Albert Einstein. However, it was not
until 1960 that Maiman built the first laser. This small but effective laser generated
laser light by energizing a ruby crystal with light from a flash tube.
Since then, the development of lasers has continued to advance. We now use lasers for
such varied things as performing surgery, scanning bar codes, cutting metal, reading
information on compact discs, and carrying communication signals.- Lasers organize irregular and jumbled light into a harmonious stream.
Lasers jumble harmonious streams of light into irregular patterns. - Though not all lasers are the same, they work essentially the same way.
Different types of lasers work in different ways. - Only small lasers are effective.
The first laser was small but effective. - Lasers are best used in surgery and for carrying communication signals.
Lasers have a wide variety of practical uses.