Before charge-coupled devices (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

Photographic glass plates were the most commonly used device for imaging with optical telescopes before the invention of charge-coupled devices (CCDs). They provided a stable and high-resolution medium for capturing astronomical images.

Before Charge-Coupled Devices (CCDs) Were Invented, What Was the Device