Reflecting telescope

Quick Facts: Who was Reflecting telescope?

Subject:

Reflecting telescope

Known for:

Telescope design using curved mirrors to reflect and form an image.

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2Day Chrono-Wiki & Primary Historical Archives

Origins & Early Life

A reflecting telescope (also called a reflector) is a telescope that uses a single or a combination of curved mirrors that reflect light and form an image. The reflecting telescope was invented in the 17th century by Isaac Newton as an alternative to the refracting telescope which, at that time, was a design that suffered from severe chromatic aberration. Although reflecting telescopes produce other types of optical aberrations, it is a design that allows for very large diameter objectives.

Career & Major Achievements

Almost all of the major telescopes used in astronomy research are reflectors. Many variant forms are in use and some employ extra optical elements to improve image quality or place the image in a mechanically advantageous position. Since reflecting telescopes use mirrors, the design is sometimes referred to as a catoptric telescope.

Enduring Legacy & Impact

From the time of Newton to the 19th century, the mirror itself was made of metal – usually speculum metal. This type included Newton's first designs and the largest telescope of the 19th century, the Leviathan of Parsonstown with a 6 feet (1.8 m) wide metal mirror.

Historical Fact-Check Quiz: Reflecting telescope

True or False: “Reflecting telescopes are often referred to as catoptric telescopes because they use mirrors to form an image.”

Answer (TRUE ⭕): This is correct; the use of curved mirrors classifies the design as catoptric, distinguishing it from purely refractive systems.

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