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It is an instrument that has the function of collecting light from a distant object and expanding it. Thanks to these requirements, the telescope has become, from the beginning of the 17th century, the architect of modern astronomy.

The discovery of the telescope is attributed, almost at the same time, to the Dutch Hans Lippershey and Galileo Galilei in 1609

A telescope, in addition to the obvious advantage of enlarging the objects, reveals celestial bodies of weak luminosity and therefore invisible to the naked eye, thanks to its objective being able to perceive more light than our eye.

In general terms, the rule is that the larger the diameter of the lens (and therefore its surface), the greater the amount of light it captures. In addition, the resolution power of the instrument always depends on the diameter of the objective of a telescope (which is usually defined more briefly when opening a telescope).

The first telescopes to consolidate throughout the seventeenth century were those of the Keplerian type, which were constructed with focal lengths of up to 30 or 40 m, in order to have a large number of increases. They provided flickering images and remarkable aberrations.

At the beginning of the 18th century, the telescope was incorporated into observation astronomy with the objective of a concave mirror and a lens. From this moment, the Reflectors (mirror telescopes are called that way because the light is reflected and directed towards a focus) and the Refractors (the lens telescopes are called that way because the light is refracted, that is, deflected passing through the lens) they will enter into dispute with alternate luck until the middle of the twentieth century, when the great reflectors will definitely succeed.

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