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Lamps as seen through a prism. In optics, a dispersive prism is an optical prism that is used to disperse light, that is, to separate light into its spectral components (the colors of the rainbow ). Different wavelengths (colors) of light will be deflected by the prism at different angles. [1] This is a result of the prism material's index of ...
t. e. PRISM is a code name for a program under which the United States National Security Agency (NSA) collects internet communications from various U.S. internet companies. [1] [2] [3] The program is also known by the SIGAD US-984XN. [4] [5] PRISM collects stored internet communications based on demands made to internet companies such as Google ...
This is a list of classic children's books published no later than 2008 and still available in the English language.. Books specifically for children existed by the 17th century. Before that, books were written mainly for adults – although some later became popular with children. In Europe, Gutenberg's invention of the printing press around 1440 made possi
Wayward Children. Wayward Children is a series of fantasy novellas by American author Seanan McGuire. It takes place at a boarding school for children who have journeyed to magical lands and been forcibly returned to the real world. The volumes alternate between being set at the school versus showing the lives of the children while they were in ...
Strabismus is a misalignment of the eyes that affects 2-4% of the population; it is often associated with amblyopia. The inward turning gaze commonly referred to as "crossed-eyes" is an example of strabismus. The term strabismus applies to other types of misalignments, including an upward, downward, or outward turning eye.
Optometrist. Optometrists are healthcare professionals with a degree in eye care, specifically. In the United States and Canada, they are Doctors of Optometry (O.D.) - this includes optical, medical and some surgical eye care. Their training typically includes four years of college followed by four years of eye specific training (Optometry school).