what is difference between light pen and joystick

A comparison is made between a light pen and a joystick, when used for free-hand drawing on a CRT-screen. The joystick proved superior for drawing horizontal and vertical lines, but hardly for anything else. The light pen proved to be an all-round instrument for free-hand drawing.
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Yes priyanka is right .
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WHY SHOULD I TELL YOU
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 light pen-a handheld pen-like photosensitive device held to the display screen of a computer terminal for passing information to the computer.

A joystick is an input device consisting of a stick that pivots on a base and reports its angle or direction to the device it is controlling. A joystick, also known as the control column, is the principal control device in the cockpit of many civilian and military aircraft, either as a center stick or side-stick. It often has supplementary switches to control various aspects of the aircraft's flight.

 
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A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's CRT display.

It allows the user to point to displayed objects or draw on the screen in a similar way to a touchscreen but with greater positional accuracy. A light pen can work with any CRT-based display and other display technologies, but its ability to be used with LCDs was unclear (though Toshiba and Hitachi displayed a similar idea at the "Display 2006" show in Japan[1]).

A light pen detects a change of brightness of nearby screen pixels when scanned by cathode ray tube electron beam and communicates the timing of this event to the computer. Since a CRT scans the entire screen one pixel at a time, the computer can keep track of the expected time of scanning various locations on screen by the beam and infer the pen's position from the latest timestamp.

A joystick is an input device consisting of a stick that pivots on a base and reports its angle or direction to the device it is controlling. A joystick, also known as the control column, is the principal control device in the cockpit of many civilian and military aircraft, either as acenter stick or side-stick. It often has supplementary switches to control various aspects of the aircraft's flight.

Joysticks are often used to control video games, and usually have one or more push-buttons whose state can also be read by the computer. A popular variation of the joystick used on modern video game consoles is the analog stick. Joysticks are also used for controlling machines such as cranes, trucks, underwater unmanned vehicles, wheelchairs, surveillance cameras, and zero turning radius lawn mowers. Miniature finger-operated joysticks have been adopted as input devices for smaller electronic equipment such as mobile phones.

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Input devices are used to give command or data into the computers. Joy stick is input device use to enter data into the computer. Joystick is a handheld device. It is usually used to play games to give the quick response to the computer. Joy stick is like a vertical handle which is griped by hand. Movement of object is handled by the handler. On the top of the button there is push button and other buttons are placed on the base of handler. Push buttons are called triggers. These push buttons or triggers are used to hitting, firing. Handler is used to move objects up and down. T

These buttons and handle give commands to the computers. Light pen isinput device. It is pointing device like mouse and track ball. Light pen is used to choose displayed menu option on screen for a particular program. It consists of small tube. This small tube has photo cells. It is 0.5 inches in width and 6.6 inches long. For connecting light pen to the computer it consist of switches and cards. Basic purpose of light pen is to facilitate engineers, graphic designers and also used to educated children.
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LIGHT PEN:
i) Light pen is computer input device.
ii) It is commonly used to select or otherwise modify text or data on a screen.
iii) The term light pen may also refer to pointing input device utilising a light that is commonly used during a presentation.
iv) A light pen may also be used to describe the pen used with a graphics tablet.
JOYSTICK:
i) A joystick is a input device.
ii) It can be used for controlling the movement of the cursor or a pointer in a computer device.
iii) This is mostly used for gaming question and sometimes in graphical application.
iv) A joystick has a base, on which control buttons can be mounted and a vertical stem, which the user can move in any direction to control the movement of an object on the screen; the stem may also have control buttons


 
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