On 21.03.2011r. there were more classes in mathematics and natural sciences.
Magnifier - an optical device used to direct observation of small objects located close. In the strictest sense it is a focusing lens to give at least three times magnification. Lenses which give less than three-fold magnification magnifying glasses are called. Magnifier is made usually with a converging lens or a geographically close group of lenses placed in the holder.
Magnifier does not enlarge the list, but only increases the viewing angle.
optical microscope - a device to a strong magnification, using to generate the image light passing through a special optical system consisting of a set of typically a few to several optical lenses.
optical microscopes are used to observe small objects in many sciences. In biology, are used for example to observe the construction of micro-organisms and tissues. In chemistry and physics are used to indicate eg crystalline transformations. The geology are used to observe the construction of the rocks.
the classes we observed various microorganisms, including skrętnice, cyanobacteria.
accommodation (nastawność eye) - the phenomenon of adaptation of the eye to view objects located at different distances. This adjustment is the proper selection of visual acuity.
Myopia occurs when the fireplace is located in front of the eye retina. Then a distant point lies in a finite distance, and with a strong defect in a very close eye. The reason is too high breaking capacity of the lens or eyeball is too long. The man with the eye condition did not see sharply without a corresponding glasses distant objects, but can correctly see the objects close. Therefore, people exhibiting myopia, to better see objects close to the eye. Hence the name - myope. Correction of myopia is done by means of glasses with lenses scattering.
Myopia - present close to the point is very far and usually it does not even exist and then the eye can not see any sharp objects. Focus of the optical system of the eye is far behind the retina. So call this defect "farsightedness" is very misleading because a person can not see well either close or distant objects. Therefore, the Polish ophthalmologists do not call this defect "foresight" but hyperopic. It is then always focusing glasses. The cause of this condition may be congenital too short antero-posterior axis (mainly in children) or too weak, the ability of focusing the lens through reducing its flexibility. This defect is corrected by focusing lenses.
