Tyndall Effect
When rays of light pass through a colloidal fluid for suspension, the tiny particles get illuminated due to scattering. Because of this, the path of light is made visible. This phenomenon is tyndall effect.
Input and output devices in a computer
Various input and output devices in a computer Input or output devices are required for users to communicate with the computer. These input/output devices are connected to the cpu through various ports or with the help of wireless technology. Input devices In simple terms, input devices feed data and instructions into the computer. •Various types of input devices: Keyboard Allows the user to input text data consisting of alphabets , numbers and other characters. Detects the key pressed and generates the corresponding ASCII Code which can be recognised by the computer . Wired and wireless keyboards are available. Mouse A small handheld device used to position the cursor or to move the pointer on the computer screen by rolling it over a mouse pad or in a flat surface . Different types of mouse are ball, optical and laser mouse . Wireless mouse is also available. Light pen A pointing device shaped like a pen. Has the advantage of 'drawing' directly on to the screen. Used by engi
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