Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(A) Light path of the scanner: A light source sends light through a sheet of glass, which diffusely reflects off a sheet of paper. It then goes back through the glass, where it is focused through a row of GRIN lenses and onto an array of sensors. (B) The row of GRIN lenses is made of transparent plastic with a radially varying index of refraction. The lens array curves the light, forming a real inverted image inside the lens and a real upright image on the sensor.
