Final answer:
Photospot/digital, or photographic film/glass plates, exhibits the lowest image frequency compared to more modern systems due to its low light efficiency, using only about 1% of the incoming light to create an image.
Step-by-step explanation:
The recording system that exhibits the lowest image frequency among the given options is photographic film or glass plates, commonly referred to as photospot/digital in the context of the question. This older technology utilizes a light-sensitive chemical coating applied to a piece of glass, which creates a permanent record of the image when developed. Despite being an improvement over the human eye, photographic films are notably inefficient, as only about 1% of the light that falls on the film is used to produce the image. In contrast, modern electronic detectors such as the charge-coupled device (CCD) are far more efficient. CCDs record images as a matrix of tiny pixels, with each pixel capable of detecting the intensity of the incoming light, rendering digital imaging significantly more efficient in capturing and utilizing light. Videotape/disc, cine, and spot film systems all involve mechanical or electronic processes that tend to utilize more of the available light