Definitions

1. adjective

In optics, an optical system where all the components have the same focal length so that the image formed by one component is at the correct position for the next.

“The parfocal lenses were crucial in achieving a high-quality image with minimal adjustments during the telescope’s assembly.”

2. adjective (optics)

Of or relating to a lens or optical system where all the components have the same focal length.

“The parfocal nature of the lens allowed for smoother and more precise adjustments during the experiment.”