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Hi all. If we make a lense shape bottle with clean water inside
is it working as lense ? 30 or 50 inches lets say ? |
#2
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"John" wrote in message ... Hi all. If we make a lense shape bottle with clean water inside is it working as lense ? 30 or 50 inches lets say ? Yes... there are telescope lenses with an oil element between glass elements. |
#4
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On Wed, 12 Nov 2003 09:38:13 -0500, "Michael A. Covington" wrote:
"John" wrote in message ... Hi all. If we make a lense shape bottle with clean water inside is it working as lense ? 30 or 50 inches lets say ? Yes... there are telescope lenses with an oil element between glass elements. ...and disturbingly so. Give me air! Alan |
#5
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"John" wrote in message
... Hi all. If we make a lense shape bottle with clean water inside is it working as lense ? 30 or 50 inches lets say ? Sure. Any particular reason you want to? Clear Skies Chuck Taylor Do you observe the moon? Try the Lunar Observing Group http://groups.yahoo.com/group/lunar-observing/ |
#6
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On Wed, 12 Nov 2003 11:32:33 -0800, "Chuck Taylor"
wrote: "John" wrote in message ... Hi all. If we make a lense shape bottle with clean water inside is it working as lense ? 30 or 50 inches lets say ? Sure. Any particular reason you want to? Clear Skies Chuck Taylor Do you observe the moon? Try the Lunar Observing Group http://groups.yahoo.com/group/lunar-observing/ I think is obviously cheap lenses for creation of big cheap = telescopes ! Mass production of these empty lenses,like bottles, you just put water or other more clean liquid inside and vuala |
#7
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I think is obviously cheap lenses for creation of big cheap =
telescopes ! Mass production of these empty lenses,like bottles, you just put water or other more clean liquid inside and vuala What, you drink the water while observing through a real lens?? Is that the plan? A lens shaped water bottle, not a bad idea.. jon |
#8
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"John" wrote I think is obviously cheap lenses for creation of big cheap telescopes ! Mass production of these empty lenses,like bottles, you just put water or other more clean liquid inside and vuala Vuala and orange juice -- wow, what a drink! |
#9
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You do need to control the thickness of the glass and also properly finish
and polish the outsides of the glass in order to do a decent scope. The surfaces on the outside need to be good spherical surfaces to 1/4 wavelength in order to make a decent scope. Raytrace the design and make sure that the glass and water combination make a good corrected triplet. -- Bob May Losing weight is easy! If you ever want to lose weight, eat and drink less. Works evevery time it is tried! |
#10
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i (John) wrote in message ...
"John" i wrote in message ... Hi all. If we make a lense shape bottle with clean water inside is it working as lense ? 30 or 50 inches lets say ? I think is obviously cheap lenses for creation of big cheap telescopes ! Mass production of these empty lenses,like bottles, you just put water or other more clean liquid inside and vuala I hate to disappoint you: But there are few such short cuts in this life or somebody else would (probably) already have taken it. Your lens-shaped bottles would have to be optically perfect (at least externally). An even more difficult task than making a solid glass lens perfect. The lens blank is stiff enough to take an accurate polished surface. A thin "bottle" lens might be much more difficult. Achromatic aberration (false rainbow colours spoiling the view through the telescope) would be awful unless you could find a suitable liquid without dispersion. Perhaps someone can suggest something suitable for the purpose if there is one. If you used two suitably shaped containers you could make an achromatic doublet. But only if you could polish your containers (or bottles) accurately enough to make it worthwhile and could find two different liquids with suitable properties. The idea is not new. At least in prisms. Triangular "bottles" made up of accurately flat glass glued together were filled with high dispersion liquids to make spectra for spectroscopes. I believe carbon tetrachloride was popular as a liquid for these filling these prisms. Chris.B |
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