Before CCDs were invented, what was the device most commonly used for imaging with optical telescopes?
A) Polaroid cameras
B) photographic glass plates
C) 35-mm film
D) high-speed film
E) video cameras

Question

Quizplus · Accepted Answer

Before CCDs, photographic glass plates were the most commonly used device for imaging with optical telescopes. These plates were coated with a light-sensitive photographic emulsion and exposed to light through the telescope, capturing the image. The plate was then developed in a darkroom to produce a visible image.

Before CCDs Were Invented, What Was the Device Most Commonly