Great Wall (Optical) Plastic Works Ltd.


What is a Fresnel Lens?

A Fresnel lens is a type of lens invented by French physicist Augustin-Jean Fresnel. Originally ....
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What is an Aspheric Lens?

An aspheric lens is a lens whose surfaces profile neither a portion of a sphere nor of a circular cylinder. Aspheric surfaces are not spherical ....
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History of Optics

Ancients used mirrors of polished copper, bronze, and speculum. Mo zi Ä«×Ó (china, born in 486BC~476BC, died in 420BC~390BC roughly), a great ideologist and politician and nature scientist. In his mo lection, the first documentary about optics in the world, described the basic optical knowledge, including the definition and creating of vision , propagation of light in straight line, pinhole imaging, the relationship ......
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History of Microscope

The first compound microscopes produced by Zacharias Janssen (Dutch,1580-1638)in 1595 , was simply a tube with lenses at each end. The magnification of these early scopes ranged from 3X to 9X, depending on the size of the diaphragm openings. In 1608, Hans Lippershey, applied for a patent on his magnifying tube which enlarged distant objects. He reported also used variations of it to enlarge subjects near at hand. A few months later, Italian instrument maker Galileo made his own magnifying tube. ....
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History of Telescope

In 1608, a Dutch eyeglass maker named Hans Lippershey looked at a church steeple through twolenses place one in front of the other and saw that the image was magnified. Unfortunately the telescopes built on Lippershey's model had poor image quality, caused by the bending of light though the glass lenses. (Glass does not bend the different colors of light equally. Red light is bent the least causing a colour distortion in the image.) ......
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History of Camera

The camera and photography are an important part of the communication history of the world. 16th Century German scientist Johannes Kepler known for his study of astronomy and optics is often referred to as the founder of modern optics. He used the simple pinhole camera (invented many centuries before his time and known to Aristotle as early as 322 BC) to understand how pictures can be formed. Early cameras of the 16th and .......
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