What role does the lens system play in NVG function?

The lens system in night vision goggles is essential because it focuses and directs incoming light onto the photocathode, which is critical for image creation. When light enters the NVG, the lens system gathers and channels this light efficiently, ensuring that it is properly aligned with the photocathode. The photocathode converts the focused light into electrons, which are then amplified through a series of processes to create a visible image. This fundamental capability of the lens system makes it indispensable for the overall function of night vision technology, allowing users to see in low-light scenarios effectively.

The other options describe functions that are not technically performed by the lens system in NVGs. For instance, increasing battery life and filtering out infrared light are not roles played by the lens; these aspects relate to other NVG components or technologies. Magnifying objects is also not the primary function of the lens system in NVGs; rather, it is designed to optimize light transmission.