Catoptrics


Catoptrics deals with the phenomena of reflected light and image-forming optical systems using mirrors. A catoptric system is also called a catopter.

Ancient texts

Catoptrics is the title of two texts from ancient Greece:
The Latin translation of Alhazen's main work, Book of Optics, exerted a great influence on Western science: for example, on the work of Roger Bacon, who cites him by name. His research in catoptrics centred on spherical and parabolic mirrors and spherical aberration. He made the observation that the ratio between the angle of incidence and refraction does not remain constant, and investigated the magnifying power of a lens. His work on catoptrics also contains the problem known as "Alhazen's problem". Alhazen's work influenced Averroes' writings on optics, and his legacy was further advanced through the 'reforming' of his Optics by Persian scientist Kamal al-Din al-Farisi in the latter's Kitab Tanqih al-Manazir.

Catoptric telescopes

The first practical catoptric telescope was built by Isaac Newton as a solution to the problem of chromatic aberration exhibited in telescopes using lenses as objectives.