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Newtonian telescope design. A Newtonian telescope is composed of a primary mirror or objective, usually parabolic in shape, and a smaller flat secondary mirror.The primary mirror makes it possible to collect light from the pointed region of the sky, while the secondary mirror redirects the light out of the optical axis at a right angle so it can be viewed with an eyepiece.
Curvature radius of lens/mirror r, R: m [L] Focal length f: m [L] Quantity (common name/s) (Common) symbol/s Defining equation SI units Dimension Lens power P
This formula is a special case of the kth forward difference of the monomial x n ... This follows from the general form of a Newton series for equidistant nodes (when ...
This Newtonian form of the lens equation can be derived by using a similarity between triangles P 1 P O1 F 1 and L 3 L 2 F 1 and another similarity between triangles L 1 L 2 F 2 and P 2 P 02 F 2 in the right figure. The similarities give the following equations and combining these results gives the Newtonian form of the lens equation.
Newton seldom referred to this prototype in later years and so his second scope is often called his first. Newton's second telescope was made in 1671; it had a mirror of 2 inches diameter and a focal length of between 6.25" and 6.3". He made two mirrors and chose the best one for the telescope.
With the publication of Opticks in 1704, [9] Newton for the first time took a clear position supporting a corpuscular interpretation, though it would fall on his followers to systemise the theory. [10] In the 1718 edition of Opticks, Newton added several uncertain hypotheses about the nature of light, formulated as queries. In query (Qu.) 16 ...
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Isaac Newton (1643–1727) investigated the refraction of light, demonstrating that a prism could decompose white light into a spectrum of colours, and that a lens and a second prism could recompose the multicoloured spectrum into white light. He also showed that the coloured light does not change its properties by separating out a coloured ...