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.
Used in snooker in reference to the position of the cue ball. It is above the object ball if it is off-straight on the baulk cushion side of the imaginary line for a straight pot (e.g. he'll want to finish above the blue in order to go into the pink and reds). It is also common to use the term high instead.