The effect of Coddington factors on aberration functions has been analysed using thin lens approximation with optical glass parameters. The dependence of spherical aberration on Coddington shape factor for the various optical glasses in real lens design was discussed using exact ray tracing for the optics education and training purposes. Thin lens approximation and thick lens design are generally taught with only lecturing method. But, thick lens design is closely related to the real life. Hence, it is more appropriate to teach thin lens approximation and thick lens design with real-life context based approach. Context based teaching can be effective in solving problems in which the subject is very difficult and irrelevant. It also provides extensive evidence for optics education that students are generally unable to correctly apply the concepts of lens design to optical instruments currently used. Therefore, the outline of real-life context based thick lens design lessons were proposed and explained in detail considering thin lens approximation.
Luminous power LED technology has been improving quite fast and it will replace completely the lighting components
that are used currently in the present decade due to its lighting advantages. This study was carried out to determine
illumination efficiencies of power LED drivers and optics. The buck-based type LED driver was selected for this study.
On this way, power LED driver circuit was designed using switching current regulator and circuit component values
were computed for maximum light output efficiency. A reflector which will enable uniform distribution of the
maximum power LED illumination to be obtained by using this driver circuit was investigated. In this case, diffusers and
Fresnel lenses were proposed depending on the use. Diffusers can be used for indoor iluminations combined with
reflectors. To this end, also Fresnel lenses were investigated.
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