In linear perspective, all parallel lines converge at a(n):
A. orthogonal.
B. vanishing point.
C. horizon line.
D. picture plane.
OK, my textbook says it both A and C so I am totally confused.
I'd go with C.
http://www.google.com/search?q=parallel+lines+converge+at+two+points+on+the+horizon&biw=1440&bih=712&source=lnms&tbm=isch&sa=X&ei=579wVMDmHoKYgwSq3YOgCA&ved=0CAYQ_AUoAQ
In linear perspective, parallel lines appear to converge at a vanishing point. This is why the correct answer is B.
In linear perspective, parallel lines appear to converge or meet at a point in the distance. This point is called the vanishing point. Therefore, the correct answer to your question is B. vanishing point.
However, it is worth mentioning that the confusion may arise because both options A and C are also related to linear perspective.
A. Orthogonal refers to a series of lines that are drawn to create depth and distance in an artwork. These lines are perpendicular to the picture plane and converge at the vanishing point.
C. Horizon line is a horizontal line that represents the viewer's eye level in a linear perspective drawing. It also serves as a guide for determining the placement and convergence of parallel lines.
So while options A and C are important concepts within linear perspective, the specific point where parallel lines converge is called the vanishing point (option B).