Working from Kepler's writings, Isaac Newton reasoned it was better to make a telescope out of mirrors rather than lenses and built a reflecting telescope in 1668. Centuries later the reflecting ...

Around 1668 he managed to produce a functioning reflecting telescope using a mirror made of a copper-tin-arsenic alloy of his own devising. ... A reflecting telescope, having no lenses, ...

Invented the reflecting telescope. The standard telescope of Newton's time, ... His original reflecting telescope, which he built himself in 1668, was just six inches long.

Invented the reflecting telescope. The standard telescope of Newton's time, ... His original reflecting telescope, which he built himself in 1668, was just six inches long.

Using liquids to create telescope mirrors is not a new idea; it was suggested by Isaac Newton, who invented a reflecting telescope in 1668.

1668 Isaac Newton invents a small but powerful reflecting telescope using mirrors. 1672 Laurent Cassegrain, a French priest, invents a reflecting telescope based on Gregory’s principles.

In 1668, he built the world’s first reflecting telescope, which had the distinction of using a curved mirror. The Royal Greenwich Observatory was founded in 1675 by King Charles II.

An optical reflecting telescope works by using a mirror to reflect incoming light. The image is formed by a reflection from a curved mirror, which is then magnified by a second mirror.