This course in Basic Optics and Optical Instruments has been compiled from various sources. The specific content and order of presentation has been determined by the requirements of Opto-Mechanical Laboratories and the experience gained from a number of classes which have been presented for opto-mechanical assembly and the opto-mechanical technician personnel. The theory of optical phenomena is neither rigidly demonstrated nor profound in concept, but is presented in a manner which will develop within the mind of the student a desire for additional knowledge which can be gained through his own efforts. In keeping with the typical objectives of industrial training (not education) a minimum of theory is used and only when pertinent to the phenomena under consideration. No previous experience in optics or mathematics beyond arithmetic has been assumed, although some algebraic demonstrations have been included to stimulate the student who might be concerned with the "tools 11 of algebra. The specific optical instruments considered in this course are usually of the commercial type. The purpose of this course is to help the user of optical instruments become more familiar with optics and certain instruments. First, the various phenomena of light and associated theory are considered. Simultaneously with the study of light phenomena, the appropriate optical components are studied, along with the assembled components that make up the special purpose instruments.