[DOC] [TLE] Chapter 6 [PAR] All lenses make use of a physical phenomena called Refraction. .... To get 
around this problem in 1668 Newton placed a small mirror at a 450 angle in front 
of... [DOC] [TLE] History of the telescope - Wikipedia [PAR] The earliest known working telescopes appeared in 1608 in the Netherlands and 
are credited ... The design of these early refracting telescopes consisted of a 
convex ... Isaac Newton is credited with building the first "practical" reflector in 
1668 ..... This meant they need more than one mirror per telescope since mirrors 
had to... [DOC] [TLE] Reflecting telescope - Wikipedia [PAR] A reflecting telescope (also called a reflector) is an optical telescope which uses 
a single or ... Although reflecting telescopes produce other types of optical 
aberrations, it is a ... on space telescopes and many types of spacecraft imaging 
devices. ... mirror is the reflector telescope's basic optical element that creates an 
image... [DOC] [TLE] Telescopes - Educational Web Sites [PAR] Apr 3, 2014 ... P--1 Links and Tables ... and the universe beyond--for all these (as well as taking 
pictures, dissecting colors etc.) ... For more, I recommend just one book ... and 
much of what follows below is described much better in his book. ... in 1668 a 
telescope whose light was collected by a curved mirror, made of an... [DOC] [TLE] telescope - The development of the telescope and auxiliary ... [PAR] May 4, 2016 ... Device used to form magnified images of distant objects. ... The reflecting 
telescope was developed in 1668 by Newton, though John Gregory had ... as 
long as 61 metres, but these instruments were too awkward to be effective. ... 
Since then, much better materials for mirrors have become available. Cer-Vit... [DOC] [TLE] telescope facts, information, pictures | Encyclopedia.com articles ... [PAR] The one characteristic all telescopes have in common is the ability to make 
distant ... The more light a telescope can gather, the more distant the objects it 
can detect, and ... In order to correct for these, multiple lenses are required, much 
like the ... Atmospheric distortions are constantly changing, so the deformable 
mirror has... [DOC] [TLE] How telescope is made - material, manufacture, making, history ... [PAR] A telescope is a device used to form images of distant objects. ... as is done today 
to make mirrors, so these early reflectors used mirrors made out of ... glass, a 
special kind of glass which is much purer and more uniform than ordinary glass. 
.... The outer, fixed jaw of the caliper is placed against one side of the lens and 
the... [DOC] [TLE] Free Astronomy Lesson 4 - Optical Devices - Synapses.co.uk [PAR] Explanation of lens and mirrors, refraction and reflection, focal points, focus and 
... of information and allow us to see much farther and better than our own eyes. 
... not be a proper astronomy course if I didn't explain how these devices work. .... 
But what's the point of making the rays converge if you cannot put that image in... [DOC] [TLE] NOVA - Official Website | Inventing Telescopes - PBS [PAR] Oct 29, 2002 ... Galileo's refractor and Newton's reflector remain the two standard types of ... clear 
whofigured out that if you placed a lens for the farsighted about 12 to ... best
that is, lenses with a plane on one side and curved surfaces on the other. ... In 
striving to make images he saw through his telescope ever larger,... [DOC] [TLE] Check and uncheck as needed to select sections to print. Then ... [PAR] The word "optical" means "making use of light." ... The main lens or mirror in an 
optical telescope is called the objective. ... These devices use semiconductor 
chips to electronically capture images. ... A large objective gathers more light 
than a small one. ... mirror. In 1668 the British scientist Isaac Newton solved this 
problem. [DOC] [TLE] Telescopes for Astrophotography - Catching the Light [PAR] As with picking a camera, picking the best telescope for your needs will ... A 
simple lens with a focal length of 300 mm will

Question: In 1668 Newton placed a mirror in one of these devices to create a much better image
Answer: a telescope