A scanner is an input device that scans documents such as photographs and pages of text. When a document is scanned, it is converted into a digital format. This creates an electronic version of the document that can be viewed and edited on a computer.
Light Pen in Input Device which is also known as Pointing Device which falls under input device.
Plotter- is Output Device used for Print the Large Size Poster,Banner and Flax.
Monitor - is output Device which give soft output.
Printer is also Output Device which Provide Hard Copy of Output.
Scanner is an input device which is used to scan the image document.