👉 Planoconical is a type of optical device that uses curved mirrors to focus light onto a surface. It was developed by German physicist Adolf Rehmann in 1895, and it has since become an important component in the design of various types of lenses and other optical devices. The term "planoconical" refers to the shape or appearance of the lens, which is typically curved or conical in shape. This type of device can be used for a variety of purposes
