This technique directs only the most central and parallel rays of the beam to the film and teeth, thus reducing size distortion and possibility of superimposing the zygomatic processes over the apexex ...

The greater the distance the better. Rays of light from this object are taken to be parallel as the object is assumed to be at infinity. Move the position of the screen behind the lens until a ...

Cone-beam geometry was chosen as the x-ray model due to the utility advantages it has over parallel and fan beam x-ray geometry (simplest real world scenario, does not require collimater in order to ...

Parallel lines are lines which are always the same distance apart and never meet. Arrowheads show lines are parallel. When a pair of parallel lines is cut with another line known as an ...