When an optical power meter is used to measure the strength of a fiber optic light signal, sensors that plug into the unit perform the _____.

The correct answer pertains to the function of the sensors used in an optical power meter. When measuring the strength of a fiber optic light signal, the sensors are responsible for converting the incoming optical signal into an electrical signal. This process, known as optical-to-electrical conversion, allows the optical power meter to analyze the intensity of the light signal and display it in a readout that can be used for diagnostics or alignment.

Understanding the operation of these sensors is crucial because fiber optic systems rely on light transmission, and being able to measure that light accurately is vital for maintaining and troubleshooting fiber optic networks. The effective conversion process ensures that the measurements reflect the true behavior of the signal as it travels through the fiber.

In contrast, the other options refer to different processes that are not applicable in this scenario. For instance, electrical-to-optical conversion is involved in the emission of signals from optical transmitters, but it is not relevant when measuring existing light signals. Signal amplification refers to boosting the strength of signals, which is again not something the optical power meter is doing during measurement. Lastly, digital conversion would imply transforming an analog signal into a digital format, which is not the primary function of the sensor in this context.