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Because computers and data communication equipment use binary code, it is easy to transmitinformation with light. Just as binary code uses only two digits (0 and 1), light has only twoproperties (off and on). Sending a 1 in binary code could result in a light quickly flashing on;sending a 0 could result in the light remaining off. For example, the letter “A” (ASCII 0x41or 01000001) could be transmitted by light as off-on-off-off-off-off-off-on. This concept isillustrated
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