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Earliest Working Telescopes was in the netherlands. people claimed to be the first to make it. Zacharias Janssen, Jacob Metius. Hans Lippershey
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Galileo uses the refracting telescope consisting of a convex objective lens and a concave eyepiece.
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Laurent Cassegrain described the design for a reflector with a small convex secondary mirror to reflect light through a central hole in the main mirror.
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It was an important advancement in reflecting telescopes John Hadley's production of larger paraboloidal mirrors made the advancement better
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The achromatic lens was developed to reduce color aberrations in objectives lenses, which allowed telescopes to be shorter and more functional. The first telescope with an achromatic lens appeared in 1733 made by Chester Moore Hall who did not make it public.
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Silvery Glass Mirrors where introduced by Leon Foucault. A important advancement to reflecting telescopes.
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The adoption of ong lasting aluminized coatings on reflector mirrors is what lead to modern day telescopes. Almost all of the large optical research telescopes used today are reflectors.
