Cylindrical lenses focus light rays onto a line instead of a point. Is that means several images will be formed from a point object aftering passing through the lens? (please see the attached files 1 and 2) If I am correct, can anyone explain to me,when you add water to a tall water glass(see attached-->3),why there is only 1 image formed?And why it is laterally inverted but not inverted? I have been confused by those for several weeks. thx a lot.