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REFLECTING TELESCOPE

Sir Isaac Newton's reflecting telescope, known also as the Newtonian telescope. It worked by concentrating light by reflection from a parabolic mirror, instead of by refraction through a lens. Newton (1642-1727) first displayed this telescope to King Charles II, based on a design of 1668. It had a focal length of 15cm and could magnify 30-40 times. Inadequate mirrors meant that the Newtonian reflector was not as refined as contemporary refracting telescope, until 1722, when James Haley ground a quality parabolic mirror. This drawing was published in the philosophical transactions of the Royal Society in 1672.
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Title:
REFLECTING TELESCOPE
Caption:
Sir Isaac Newton's reflecting telescope, known also as the Newtonian telescope. It worked by concentrating light by reflection from a parabolic mirror, instead of by refraction through a lens. Newton (1642-1727) first displayed this telescope to King Charles II, based on a design of 1668. It had a focal length of 15cm and could magnify 30-40 times. Inadequate mirrors meant that the Newtonian reflector was not as refined as contemporary refracting telescope, until 1722, when James Haley ground a quality parabolic mirror. This drawing was published in the philosophical transactions of the Royal Society in 1672.
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Album / Science Source
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Image size:
2550 x 3787 px | 27.6 MB
Print size:
21.6 x 32.1 cm | 8.5 x 12.6 in (300 dpi)
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