Question

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

A. Light pen

B. Reflectors

C. Deflector

D. All the above​

Answer 1

Light pen is the answer to the question.

This device is an input device that is used on the computer.  It is a light sensitive device that can select written words on the computer, it can draw and can also interact with other elements on the computer screen.

It is simply like the mouse. It performs similar operations like the computer mouse. It contains a photocell and a an optical cell that is placed in an object that resembles a pen.

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