Which device containing sensors send signals to computer whenever light changes are detected ........

Computer GK Computer Peripherals

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Which device containing sensors send signals to computer whenever light changes are detected?

Light pen

Reflectors

Deflector

All the above

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Explanation:

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