Fundamental Understanding of the Propagation of Light Using Geometry

A.K. Alsamarrai

Iraqi Journal of Applied Physics Letters الرسائل العراقية في الفيزياء التطبيقية
ISSN: 1999656X Year: 2009 Volume: 2 Issue: 4 Pages: 29-32
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة


The treatment of light as wave motion allows for a region of approximation in which the wavelength is considered to be negligible compared with the dimensions of the relevant components of the optical system. This region of approximation is called geometrical optics. When the wave character of the light may not be ignored, the field is known as physical optics. Since the wavelength of light is very small compared to ordinary objects, early unrefined observations of the behavior of a light beam passing through apertures or around obstacles in its path could be handled by geometrical optics.


Optics --- Light propagation --- Geometrical optics --- Optical path length