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

Question

Quizplus · Accepted Answer

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

Before CCDs Were Invented,what Was the Device Most Commonly Used