Though it is impossible to correct all known aberrations in man-made lenses, they can be effectively masked by the combination of several precision lenses. These may be cemented along with Canada balsam, a resin from the northern US balsam fir tree. Some lenses are coated to prevent “ghosting” or reflections from forming. Complex systems are also employed in telescopes, binoculars and microscopes. These apply the theory of a convex objective lens for casting an image in the microscope or telescope tube, which isn’t shown on any screen but is created to fall in the focal length of an eyepiece. The image formed there’s then viewed thru the eyepiece, giving a magnified view of the object.
The inverted narrate of the image does not really matter in the microscope. (The slide being viewed can be turned upside down first.) But no ship’s captain would be satisfied with his binoculars or telescope if his next port of call appeared reversed. For this reason a correcting set of lenses or prisms is introduced between the objective lens and the eyepiece to rectify that problem. Lens making by clever men involves an extensive understanding of optics, refraction-of-light mathematical formulas and then patient talent, learned and amassed over many years of coaching by another skilled in these arts.
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