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O/P
Output.
Objective
The very first optical element at the front of a lens.
Ocular
The very last optical element at the back of a lens (the one closer to the CCD chip).
Oscilloscope
Also CRO, from "Cathode Ray Oscilloscope". An electronic device that can measure the signal changes versus time. A must for any CCTV technician.

 

 

 

 

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