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Focal Length Distant Objects
1,280 wordsLight and other kinds of electromagnetic radiation coming from the universe outside the Earth must travel enormous distances through space and time to reach observers. Only the brightest and nearest stars can be seen with the unaided eye. To see farther and to clarify and measure what is seen, a telescope is needed. The word telescope is derived from the Greek words tele, "from afar, " and shops, "viewer. " Even a simple homemade telescope can clearly show Saturn's rings, Jupiter's bands and red...
Free research essays on topics related to: light rays, telescope, distant objects, focal length, mirror -
Los Angeles Systems Theory
1,859 wordsThe Roy Adaptation Model for Nursing had it's beginning with Sister Callista Roy entered the masters program in pediatric nursing at the University of California in Los Angeles in 1964. Dorothy E. Johnson, Roy's advisor and seminar faculty, was speaking at the time on the need to define the goal of nursing as a way of focusing the development of knowledge for practice. During Roy's first seminar in pediatric nursing, she proposed that the goal of nursing was promoting patient adaptation. Johnson...
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19 Th Century 20 Th Century
4,737 wordsPhotography is a technique of producing permanent images on sensitized surfaces by means of the photochemical action of light or other forms of radiant energy. In todays society, photography plays important roles as an information medium, as a tool in science and technology, and as an art form, and it is also a popular hobby. It is essential at every level of business and industry, being used in advertising, documentation, photojournalism, and many other ways. Scientific research, ranging from t...
Free research essays on topics related to: technological advances, focal length, 20 th century, 19 th century, floppy disk
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