![]() The invention of the achromatic lens in 1733 partially corrected color aberrations present in the simple lens and enabled the construction of shorter, more functional refracting telescopes. The idea that the objective, or light-gathering element, could be a mirror instead of a lens was being investigated soon after the invention of the refracting telescope.The potential advantages of using parabolic mirrors-reduction of spherical aberration and no chromatic aberration-led to many proposed designs and several attempts to build reflecting telescopes.In 1668, Isaac Newton built the first practical reflecting telescope, of a design which now bears his name, the Newtonian reflector. Galileo heard about the Dutch telescope in June 1609, built his own within a month,and greatly improved upon the design in the following year. Their development is credited to three individuals: Hans Lippershey and Zacharias Janssen, who were spectacle makers in Middelburg, and Jacob Metius of Alkmaar. The earliest recorded working telescopes were the refracting telescopes that appeared in the Netherlands in 1608. They found use in terrestrial applications and astronomy. The first known practical telescopes were invented in the Netherlands at the beginning of the 17th century, using glass lenses. ![]() A telescope is an instrument that aids in the observation of remote objects by collecting electromagnetic radiation (such as visible light). ![]()
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