Abstract
The goal of this paper is to create two interactive electronic materials for teaching geometrical optics, specifically for image formation with thin lenses. GeonexT mathematical dynamic geometry software is employed for preparing the materials.
Readers are also acquainted with the derivation of the rendering equation for a thin lens using a method that can also be presented to secondary school students. The paper does not describe a detailed procedure for preparing both constructions, and as an appendix we attach the original procedure for the construction as exported by the program.
The values of parameters a, a' and f that are measured directly by the created construction will be compared in the results with the results of these parameters, which are obtained from the derived rendering equation. In this way, we will confirm the correct function of the interactive constructions that have been created.
The conclusion of the paper summarises the advantages and disadvantages of the created teaching materials.