Sequential Fragmentation of a Visual Display Specifically Applied to the Teaching of Elementary Geometric Optics

An unusual concept in the teaching of elementary geometric optics has been developed, based on a comprehensive system of carefully prepared, closely integrated visual teaching aids. The basis of the system is a building up in overlays of the individual figure which retains the precision usually associated only with conventional single‐layer illustration. Before presenting the figure to the students, the instructor breaks the figure down into meaningful fragments and then constructs the figure in class by introducing its concepts in a sequence of overlays. The materials are uniform in their style, execution, and orientation, to allow interchangeability without confusion.