View _exp_open not found
View _exp_open not found
View _exp_open not found
Learning focus
Lenses are made of an optically denser material, so that light is refracted in them. Light is refracted in the lens so that, depending on the focal length of the lens, a divergent, parallel, or convergent light beam becomes either a divergent, parallel, or convergent light beam.
After the theory module, there are two modules containing experiments, which deal with the study of a converging lens and measuring its focal length. In essence, both of them support the learning content of the theory module, the first with lens models, the second with lenses. In a lesson, you can go through one of them, both of them, or you can limit yourself to, for example, watching experiment videos, without doing the experiments yourself.
It is worth mentioning that students generally cannot imagine what a parallel beam of rays means in real life, i.e. they cannot find it and study it. In this regard, experiments with lenses are useful for gaining relevant experience.
Measuring the focal length of a diverging lens is a more complicated experiment. But if you want students to understand what the focus or focal point of a diverging lens actually means, this could be a useful exercise.
Lens systems are more of an add-on for the more sophisticated.
Is the lens as such interesting?
One piece of glass with a special shape
Alustame läätsede, optiliste süsteemide, optilise peatelje ning läätsede keskpunktide defineerimisega.
Lenses and lens models
Optical systems and optical principal axis
Uurime poolketta kujulist läätse mudelit. Võrdleme seda meie antud läätse definitsiooniga.
The lens model focuses light from a point light source
Focal length and optical power of the lens model
Kordame läätse mudelitega tehtud katseseeriat ka läätsedega.
A converging lens focuses the light from a point light source.
Focal length and optical power of a converging lens
Lõpuks hajutava läätse mudel.
Focus of a diverging lens
Compound lenses formed from lens models
