You read about catoptric (reflecting) and dioptric (refracting) telescopes in the previous posts. Now, we will study the third kind – catadioptric. The term, as is evident, is a portmanteau of the former two terms (catoptric + dioptric = catadioptric), not just literally but also technically. A catadioptric telescope is one where refraction and reflection…

The refracting telescopes, in older days, suffered from severe chromatic aberration, which is now being dealt with in a variety of ways including better refractor designs.However, back in the 17th century, a new design arose that acted as an alternative to the refractor design, not suffering from chromatic aberration, owing to the fact that only…

A refracting or refractor telescope is a type of telescope that uses a lens as its objective to form an image. Refracting telescopes are also referred to as dioptric (i.e. dealing with refraction of light, especially by lenses).[1] These were the earliest type of telescope used. In fact, all the startling discoveries that Galileo did,…