Light pen essay

It has a mechanism by which ink is made to flow through the tip of the writing instrument in the way it is scribbled onto the surface. Pen is the most important thing which a literate person possess. It is the device which makes possible to note down our thoughts in a piece of paper. The earliest pen were quills, ink brush, etc.

A light pen may refer to any of the following: Lightpen1. A light pen is a light-sensitive pointing input device commonly used to select or otherwise modify text or data on a screen. Used with a CRT monitor, these devices were an early form of manipulating and highlighting data on the screen.

A doctor uses it to prescribe medicines. All people have different purposes of using pen. One cannot do everything verbally. Some purposes needs records and it is convenient to express on paper. Before electronic devices such as printer or anything else, it was only pen which used to be employed for writing.

The earliest pen were quills, ink brush, etc. The end was generally sharp modification to those wooden pieces or the feathers, which had to be dipped in ink and then written on paper. Why Pen Is Powerful Device ?