Which subassembly of a night vision goggle is responsible for filtering certain wavelengths of light?

The subassembly of a night vision goggle that is responsible for filtering certain wavelengths of light is the infrared filter. This component plays a crucial role in allowing only specific wavelengths of light to pass through while blocking others, which helps optimize the image quality in low light conditions. By filtering out unwanted light frequencies, the infrared filter enhances the performance of the night vision goggles, ensuring that the user has a clearer and more accurate view of their surroundings in the dark. The other components, while essential to the overall functionality of the night vision goggles, serve different purposes: the objective lens focuses the incoming light, the image intensifier tube amplifies the low light image, and the eyepiece lens allows the user to view the magnified image produced by the system.