In late 1668 he was able to produce this first reflecting telescope.

On his back porch, though, he does use a 14-inch reflecting telescope.

Newton's idea for a reflecting telescope was not a new one.

And his studies in optics led to the first reflecting telescope.

The idea of a reflecting telescope had been around for some time before Newton's invention.

Within a few decades, the reflecting telescope was invented, which used mirrors.

The reflecting telescope which uses an arrangement of mirrors to form an image.

Towards the end of the 19th century very large silver on glass mirror reflecting telescopes were built.

That got him to the parabola, and he explained the reflecting telescope.

In the early 1930s he constructed his first astronomical clock and at the same time a large reflecting telescope.

They are used as objectives for large reflecting telescopes.

Reflecting telescopes, just like any other optical system, do not produce "perfect" images.

Isaac Newton was the first to successfully build a reflecting telescope in 1668.

The 16-inch reflecting telescope is the largest research telescope in the state.

It is the equivalent of mirror sag in reflecting telescopes.

Isaac Newton has been generally credited with building the first reflecting telescope in 1668.

The largest reflecting telescopes currently have objectives larger than 10 m (33 feet).

With his self-built reflecting telescope he observed the planets and stars.

In 1671, the Royal Society asked for a demonstration of his reflecting telescope.

In 1937 it was the biggest amateur reflecting telescope in the world.

Johnson became involved with telescopes when he built a 6" reflecting telescope for his two sons.

In late 1668 Isaac Newton built his first reflecting telescope.

Lord Rosse had a variety of optical reflecting telescopes built.

It was not until the 20th century that they were gradually superseded by large reflecting telescopes for professional astronomy.

The era slowly came to end as large reflecting telescopes superseded the great refractors.