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Jaecks, Duane H. – Annals of Science, 2010
The optical quality and properties of over 200 telescopes residing in museums and private collections have been measured and tested with the goal of obtaining new information about the early development of the achromatic lens (1757-1770). Quantitative measurements of the chromatic and spherical aberration of telescope objective lenses were made…
Descriptors: Time Perspective, Optics, Astronomy, Science Activities
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Featonby, David – Physics Education, 2010
This article examines several readily available "magic tricks" which base their "trickery" on physics principles, and questions the use of the word "magic" in the 21st century, both in popular children's science and in everyday language. (Contains 18 figures.)
Descriptors: Physics, Science Instruction, Teaching Methods, Scientific Principles