Trivia: What does “SLR” stand for?
Source light reflection
Second lens radial
Single-lens reflex
Serial light response
Correct Answer: Single-lens reflex
So why is this answer correct? : Single-lens reflex, or SLR, cameras use a mirror and prism to allow the photographer to see exactly what will be captured in each shot. Debuting in the late 19th century, this was a useful innovation, as previous rangefinder cameras often produced an image quite different from that which was seen through the viewfinder. More recently, SLR technology has been superseded by digital LCD preview screens.