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In the 10th century AD, the Chinese referred to transparent crystals that became iridescent after exposure to sunlight as "Wuguangshi" or "Fanguangshi," indicating that they "shine in five colors like a rainbow when exposed to sunlight." This was the earliest known observation of light dispersion in the world, revealing that people had begun to view light dispersion as a natural phenomenon, rather than a mystical one. This knowledge predated Isaac Newton's experiment with prisms, in which he separated white light into seven colors, by about 700 years.
Optical Prisms
Optical prisms are categorized into several types based on their geometry and applications:
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Triangular Prism: A triangular prism has two refracting surfaces forming a triangle with an angle at the top, known as the apex angle, and a base opposite to it. According to the law of refraction, light passing through a triangular prism bends twice towards the base. The angle between the incident and exiting light is called the deviation angle.
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Right-Angle Prism: A right-angle prism is typically used to change the path of light or to rotate images by 90 degrees. Depending on its position, it can create images that are consistent horizontally but inverted vertically, or consistent vertically but mirrored horizontally. Right-angle prisms are also used in applications like image merging and beam shifting.
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Pentagonal Prism: A pentagonal prism is a 90-degree light beam deflector. Its two main uses are to redirect an incident beam by a constant 90-degree angle regardless of its initial angle, and unlike right-angle prisms, it does not produce image rotation or mirror reflection.
Applications of Prisms
Prisms are used in a variety of fields due to their ability to manipulate light:
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Consumer Electronics: Prisms are found in cameras, closed-circuit television, projectors, digital cameras, and camcorders.
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Science and Technology: Prisms are used in telescopes, microscopes, leveling instruments, fingerprint scanners, solar converters, and various measuring devices.
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Medical Instruments: Prisms are employed in cystoscopes, endoscopes, and various laser treatment devices.
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