Approximately what percentage of the light falling on a typical photographic plate from a telescope is actually used to record an image on this plate?

Question

Quizplus · Accepted Answer

Only about 2% of the light falling on a typical photographic plate from a telescope is actually used to record an image. The majority of the light is not utilized in the photographic process, making it a relatively inefficient medium for capturing images compared to modern digital sensors.

Approximately What Percentage of the Light Falling on a Typical