Which component redirects the energy and focuses it onto the multi-element infrared detector array?

• A. Collimator Assembly
• B. Imager Assembly
• C. Detector Array
• D. Video Indicator

Answer: (B)

The key idea is how optics create an image on the detector. The imager assembly contains the focusing optics—lenses or mirrors—that collect infrared radiation from the scene and bring it to a focus on the multi-element detector array. This forms a mapped image, with each detector element sampling a specific part of the scene so the array can convert photons into electrical signals and produce a coherent thermal image. The other components don’t form the image: a collimator assembly produces parallel beams rather than a focused image on the detector; the detector array itself is the sensor that converts light to signals but relies on the focusing optics in the imager to deliver the image to it; and the video indicator only displays the results, not redirecting energy to the detector.