The original instrument to occupy the 25-foot diameter dome was the 10.5-inch Bausch refracting telescope (f/15.5) installed in the brand new observatory in 1953. Bausch & Lomb Company gave the ...

Designers of refracting telescopes figured out ... Despite myriad embellishments, however, most optical telescopes in use in the 21st century derive from the two types developed in the 17th ...

Refracting telescopes dominated the nineteenth century, with the size of apertures rising to reach the physical limits for lens manufacture at a diameter of around one metre. A key optical ...

Just a decade later in the 1890s, Otto began developing optical disks for refracting telescopes—fostering a deeper understanding of the universe and beginning a long and storied history of the ...

We are at a critical time and supporting climate journalism is more important than ever. Science News and our parent organization, the Society for Science, need your help to strengthen ...

Early optical researchers replicated raindrops ... and the majority of refracting telescopes are designed this way, even today. Early telescopes were all refracting telescopes of the kind Galileo ...

An affordable telescope that can easily take images of the moon and sunspots on the sun thanks to a planetary camera will please some, but a flimsy build quality and a lack of optical prowess ...

A refractor uses lenses to refract light and ... it was done so by experimenting with putting lenses together. Today, a telescope's optical design involves complex computer modelling and large ...