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Comprising Illustrations of Light and Colours--practical Descriptions of All Kinds of Telescopes--the Use of the ... to a near approximation, the powers of telescopes, is as follows : — Endeavour to find the focus of a single lens which is exactly ...
The aerial refracting telescope. .. - - • - - - • * 226 47. The common refracting telescope. .. - - - - - - - - 228 48, 49, 50. Manner in which the rays of light are refracted in telescopes. - - - - - - - - - - 231 51. Telescope with a single lens. - - • • 234 52.
The astronomical telescope 218 45. 46. The aerial refracting telescope 226 47. The common refracting telescope 228 48, 49, 50. Manner in which the rayB of light are refracted in telescopes. .. -. .. ." .• .• •« •. *31 51. Telescope with a single lens.
focal length of the object-glass was adjusted to this luminous object, by the rack of the eyepiece of the telescope, ... While a single lens was used at the eye-end of the earlier telescopes, it was ascertained that the spherical aberration of a ...
focal length of the object-glass was adjusted to this luminous object, by the rack of the eye. piece of the telescope, n0 ... While a single lens was used at the eye-end of the earlier telescopes, it was ascertained that the spherical, aberration of a ...
If the solar focal distance of the object-glass of the telescope be divided by the focal distance of its eye-piece, considered as a single lens, the quotient will express the magnifying power of the telescope. An ordinary celestial eye-piece consists ...
If the solar focal distance of the object-glass of the telescope be divided by the focal distance of its eye-piece, considered as a single lens, the quotient wil
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Objects seen through this telescope are inverted, and on that account it is inapplicable to land observation; but at sea, it is ... In the common telescopes, if two lenses were used instead of the single object and eye-glass, as shown in the above ...
If the lens has a icjcal length of 10 or 12 feet, the magnifying power will be from 20 to 24 times, and the satellites of Jupiter will be distinctly seen through this single lens telescope. To a very short-sighted person, whd sees objects distinctly at a ..
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First of all a single lens saves about 10% of the light. Each surface of glass through which light passes transmits 95 to 96% of that light, so that a single lens transmits approximately 90%, two lenses 81% and so on. This loss may be enough to ...
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