The barcode (sample code) used to identify the candidate's information in the answer card of the 2013 midterm examination paper in Wuxi City is shown in the figure. When the barcode scanner illuminates it, the black
| Test Analysis: According to the phenomenon of light reflection and what determines the color of an object to analyze. White objects reflect all colors of light and black objects absorb all colors of light. A white object reflects all colors of light and a black object absorbs all colors of light. When a barcode scanner illuminates it, the black stripes will absorb the light, the white stripes will reflect the light, and then through the computer decoding can obtain the relevant information of the candidates. |