What is jonson and janson lens?

As an AI language model, I can provide you some information about Jonson and Janson lenses, but I want to clarify that there are no known "Jonson lenses" in the optics industry. However, there is a common type of lens known as the "Janson lens," which is also referred to as a "Jenoptik plano-convex lens."

A Janson or Jenoptik plano-convex lens is a type of lens with one convex and one flat surface. The lens is thick at the center and thin at the edges. It is commonly used in optical systems to focus, condense or diverge light. Jenoptik plano-convex lenses are usually made of high-quality glass or plastic materials, which offer excellent optical performance and durability. This type of lens is also scratch-resistant and can operate in a wide range of temperatures.

On the other hand, Ben Jonson was an English playwright and poet who lived in the late 16th and early 17th centuries. He was one of the most significant literary figures of his time and produced several popular plays that are still performed today, such as "Volpone," "The Alchemist," and "Every Man in His Humour." However, there is no known connection between Jonson and Janson lenses.