The concave lens is the one on the right. The image is: virtual erect (the same way up as the object) diminished (smaller than the object) nearer to the lens than the object and located at a distance from the lens less than the focal length.. It's virtual, upright and reduced.
Snooker tables are considerably larger than pool or billiard versions, their height is somewhat reduced and the pockets are smaller. Because this cue game utilizes higher number of smaller balls, these differences come as natural. The standard dimensions of a snooker table utilized in Europe are 12Ã6 feet.
Historically, sports played on pool tables have been known as billiard sports and include snooker or English billiards, typically played on a table with six pockets, carom billiards, usually played on 10-foot tables without pockets and pool, the most common billiard sport, generally offering six-pocket tables of various lengths.