In an artwork using perspective, at which point do the orthogonal lines in the work merge? in an artwork using perspective, the orthogonal lines in the work merge at the (blank) point.

The orthogonal lines in the work merge at the vanishing point. In a perspective drawing, the artist uses parallel diagonal lines which meet and diminish to a vanishing point. These lines are called orthogonal and create the perspective and a more realistic view. The vanishing point offers the painting a three-dimensional look.