LYCOS RETRIEVER 
Refractive Index
built 655 days ago
The Refractive Index - n - of a medium is a measure for how much the speed of light is reduced inside the medium. The speed of light in a medium can be expressed as
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The refractive index of bovine corneal samples was measured with a standard Abbé bench model refractometer (Ealing Electro-Optical, Watford, UK). Ten bovine eyes were obtained from a local abattoir. The eyes were removed and transported in a sealed moist chamber with a conjunctival flap to prevent desiccation. The epithelium was removed by gently scraping with a scalpel blade. The cornea was removed from the globe by cutting just within the limbus, and the anterior stromal surface was placed on the measuring prism table of the refractometer. The preliminary adjustments and calibration of the refractometer were performed earlier, in accordance with the supplier’s instructions.
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The gap between tissue layers naturally formed a bioconvex shape, an ideal structure for a normal refractive index. Independently, a transparent layer and a nontransparent layer split forward from the lens: the cornea and iris. Separation of the forward layer again forms a humour, the aqueous humour. This increases refractive power and again eases circulatory problems. Formation of a nontransparent ring allows more blood vessels, more circulation, and larger eye sizes.[8]
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The fully digital electronic design facilitates new features not available in other refractive index detectors. The LabIndex is not only a detector, it is ... an analog-to-digital interface for other detectors. This unit can be used as a master system for LC systems.
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As part of the Optometronic 2000™ system, Nanonics Imaging has introduced a module that provides a high-resolution solution to the problem of refractive index profiling (RIP). It combines the technology of aperture-based near-field scanning optical microscopy (NSOM) with lens-based optical differential interference contrast (DIC). This combination yields important advantages that permit high spatial and refractive-index resolution of exposed and embedded waveguides.
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The refractive index of the imaging medium is critical in determining the working numerical aperture of a microscope objective. A dramatic increase in numerical aperture is observed when the objective is designed to operate with an immersion medium such as oil, glycerin, or water between the front lens and the specimen cover glass.
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Refractive Index