1. A camera with focal length f has taken a picture of a cube on the floor of a room as shown in Figure 2. Three of the sides of the image of the cube lie on lines that intersect at the point on the image plane with camera coordinates (10, 0, f). Find the orientation of the sides of the cube in 3D (i.e find 3D vectors that are parallel to the sides of the cube in 3D), expressed in the camera coordinate system.