was invented (inventor unknown) called a reading stone. Circa 1284= Italian‚ Salvino D’ Armante is credited inventing the first bearable eye glass. 1590= two dutch eye glass makers‚ Zaccharias Janssen and Hans Janssen experimented with multiple lenses. 1665= English Physicist‚ Robert Hooke looked at a silver of cork through a microscope lens and noticed some “pores” or “cells”. 1674= Anton Van Leeuwenhoek built a simple microscope with only one lens to examine blood‚ yeast‚ insects‚ and many
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realized that the strength of the light could be increased by increasing the height of the flame. In an attempt to address this problem‚ Fresnel conducted several trial experiments that involved refraction of light on horizontal planes using thin lenses. After several attempts‚ he managed to develop a multipart lens for Lighthouses in 1822. The lens had light refraction and reflection ability. In addition‚ Fresnel managed to capture 80% of light from the source‚ making his discovery highly efficient
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into an electronic signal that can be stored (using video tape‚ optical disks‚ or computer memory‚ transmitted‚ and displayed on a television receiver or monitor. Whether digital or analog‚ and regardless of their size‚ cost‚ and quality‚ all video cameras operate on the same basic principle: they transduce (translate) the optical image that the lens sees into a corresponding video picture. More specifically‚ the camera converts an optical image into electrical signals that are reconverted by a television
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Contents 1) Sulphuric Acid----------------------------------------------------------------(1-6) a. Uses of sulphuric b. Manufacture of sulphuric acid c. Sulphur dioxide and environmental pollution 2) Ammonia and Its Salt-----------------------------------------------------(7-10) d. Uses of ammonia e. The properties of ammonia f. Manufacture of ammonia g. Preparation of ammonium fertilisers 3) Alloys------------------------------------------------------------------------(11-14)
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in an office‚ they would need to know how to work well with others and know how to run an office. An optometrist can also work for someone else‚ “They may be a private practitioner‚ operate a franchise optical store‚ or be an employee of another Optometrist. Private practitioners or franchise optical store operators may also be responsible for running their office...or work for HMOs or hospitals‚” (Field). This shows that there are many places open for an optometrist to work at. Optometrists have a
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The small sizes of the lenses means that a simple design can give good optical quality but sometimes unwanted effects arise due to optical diffraction at the small features. A typical micro lens may be a single element with one plane surface and one spherical convex surface to refract the light. Because micro lenses are so small‚ the substrate that supports them is usually thicker than the lens and this has to be taken into account in the design. More sophisticated lenses may use aspherical surfaces
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ago‚ The JBB Optical Stop‚ located at Lorez Plaza in Antipolo‚ a definitive name in the eyewear and eye care industry‚ began its pioneering concept of a one-stop eyewear center in 2008 with eye care service sales and fashion center‚ all under one roof. People behind this innovative endeavor are Dr. Gil E. Divinagracia‚ an Optometrist and Dr. Noel Santos‚ another Optometrist. The Optical Shop was borne in response to the growing public need for the convenience of getting all their optical products in
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The Power of Brand Names Brand names have become a dominant factor in consumer marketing of a myriad of products‚ ranging from potato chips to refrigerators to tennis shoes. In looking at the historical development of brand names‚ Coca-Cola® was one of the first nationally recognized brands to come along. The Coca-Cola Company printed its first consumer calendar in 1891. Another early national brand name was Gillette® razor blades. King Gillette invented the first disposable razor blade in 1903
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and risk factors People are able to see because the front part of the eye bends (refracts) light and points it to the back surface of the eye‚ called the retina. Nearsightedness occurs when the physical length of the eye is greater than the optical length. This makes it more difficult for the eyes to focus light directly on the retina. If the light rays are not clearly focused on the retina‚ the images you see may be blurry. Nearsightedness affects males and females equally. People who
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brain. There‚ the signals are turned into pictures so we can see. Telescope... A telescope is an instrument that aids in the observation of remote objects by collecting electromagnetic radiation (such as visible light). The first known practical telescopes were invented in the Netherlands at the beginning of the 17th century‚ using glass lenses. They found use in terrestrial applications and astronomy.Within a few decades‚ the reflecting telescope was invented‚ which used
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