brennpunkt

Brennpunkt, literally "focal point" in German, is a term used in science and everyday language. In optics, a Brennpunkt is the point on the optical axis where light rays converge after refraction by a lens or reflection from a curved mirror. For a simple converging lens, rays that are parallel to the axis meet at the focal point on the opposite side of the lens; the distance from the lens to that point is called the focal length. The concept is fundamental to the functioning of cameras, microscopes, and projection systems.

In figurative usage, Brennpunkt denotes the central issue or main focus of attention in a discussion, event, or situation. It is commonly employed in journalism and politics to describe what is most relevant or contentious at a given moment.

Brennpunkt is also the title of a German investigative television program broadcast on the public broadcaster ARD, typically appearing as a documentary report on current affairs. Produced by ARD member stations and aired on Das Erste, the program is known for in-depth investigations into political, economic, and social topics and for presenting findings with accompanying data and interviews. It forms part of Germany's public-service journalism landscape and has contributed to public discourse on various issues.