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| Words: 673 | Submitted: 04-Jun-2011
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During the 1st century AD (year 100), glass had been invented and the Romans were looking through the glass and testing it. They experimented with different shapes of clear glass and one of their samples was thick in the middle and thin on the edges. They discovered that if you held one of these “lenses” over an object, the object would look larger.
Someone also discovered that you can focus the rays of the sun with one of these special “glasses” and start a fire. These early lenses were called magnifiers or burning glasses. The word lens by the way is derived from the Latin word lentil, as they were named because they resembled the shape of a lentil bean (look up lens in a dictionary).
These lenses were not used much until the end of the 13th century when spectacle makers were producing lenses to be worn as glasses.
The early simple “microscopes” which were really only magnifying glasses had one power, usually about 6X - 10X. One thing that was very common and interesting to look at was fleas and other tiny insects. These early magnifiers were hence called “flea glasses”.
The rays of light coming from a distant object (PQ) form a parallel beam of light. This parallel beam of light is focused by the objective in a plane passing through its focus and perpendicular to the axis and forms the image (PlQl). This plane is known as focal plane. The eyepiece is adjusted so that the image PlQl lies in its focal plane. The light beam after striking the eye lens emerges parallel and final image PllQll is formed at infinity. This adjustment of the telescope is known as normal adjustment.
.Basically, it takes a very strong magnifying glass and sets it close to the object to be viewed. Then it refocuses the light so that you can see it through the eyepiece.
Microscope has improved because medical centres need to have a number of features. For example, surgeons benefit from microscopes that have ‘apochromatically corrected colour which means can see a truer colour of the things they are observing under the microscope. These microscopes can cost hundreds of thousands of dollars and are used in hospitals.
Given how much microscopes have improved, I believe that ...
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