Laser has found many uses like in eye surgery for removal of cataract etc. It has also found use in various scientific applications. For the common man the laser pointer has come as a very handy and convenient tool for various activities. The lecturer in a class in uses laser pointers red to pin point any particular object on a map or anything drawn or written in the board. These pointers are more popularly known as pointer pens. The laser pointers red have displaced almost completely the long tapered stick that used to be the common feature of a lecturer in a college or a speaker in a seminar.
Laser pointers come in different colors like green, red, etc. For some reason, laser pointers red more commonly used have certain properties which the other colors like violet do not have. This is particularly so when low cost high power are required. The have helped in the development of other in green, violet etc. Even otherwise the infrared component in other colors is noticeable and filtering it out is not advised. All including are handy instruments and a few of them being ultra small easy to carry. You can get cheap pointers that are high power also.
The pen including were all designed to project a bright colored like spot on it. There are variously used with different powers. Doctors advise that people should be using only the lowest powered pointers. Frequent or constant use of laser pointers red and pointers of other colors with higher output may cause damage to eyes. People are advised not to buy the high powered laser pens that are being advertised in different websites. The laser beam which is invisible even in clean atmosphere shows its power when it is an opaque object.
It is amazing that if laser pointers red, if directed at aircraft at night the pilots get distracted. There are laws prohibiting such use. The laser pointers red are also used for teaching astronomy to students, pointing them towards various stars in conjunction with astronomer's telescope. Being visible even in daylight, the has become a very useful aid for signaling, in variety of operations. Being small and light weight the pointers can be carried in a pocket or a kit for emergencies. Laser pens are made with different power outputs for various applications and the cost varies accordingly.
This has been so even from the earliest pointers that was manufactured.
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10 Aug, 2011
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Source: http://goarticles.com/article/Versatile-light-beam-laser-pointers-red/5125692/
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