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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 refraction varying with ...
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.
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 possible mass production of books, though the first printed books were quite expensive and remained so for a long time. Gradually, however, improvements in ...
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.
In the United States, pediatric ophthalmologists are physicians who have completed medical school, a 1-year internship, 3-year residency in ophthalmology, and a 1-year fellowship in pediatric ophthalmology and strabismus. Pediatric ophthalmology fellowships in the United States are accredited by the American Association for Pediatric Ophthalmology and Strabismus .
All three types of professional perform screenings for common ocular problems affecting children (such as amblyopia and strabismus) and adults (such as cataracts, glaucoma, and diabetic retinopathy ). [14] All are required to participate in ongoing continuing education courses to maintain licensure and stay current on the latest standards of care.
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