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Thread: lenses creating a virtual image?

  1. #1 lenses creating a virtual image? 
    Forum Cosmic Wizard icewendigo's Avatar
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    As a teen I visited a science museum which had a cylinder with a glass top and there were a few small objects on it. So you walk around and see these objects and wonder why they bothered putting a marble and a trinket or two, until you wonder maybe you can pickup up the marble and do something with it, but when you reach for the objects you think are real your fingers go right through them, its mind boggling, as if solid objects were an illusion. Freaky.

    I figured the objects were inside the cylinder and a cleaver configuration of lenses gave everyone around the cylinder the image of objects, except if you viewed from the side at the same height (angle below 10 degrees verticaly) or where just about right above (about over 80 degrees verticaly), but from most vertical angles (ex:10-80) and all around (360) you would swear there were actual objects lying around on top of the cylinder.

    Has anyone else seen this, and does anyone know what lense(mirror?) configuration was used?


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  3. #2  
    Forum Radioactive Isotope MagiMaster's Avatar
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    I can't find the general name for this, but here's a page describing how it works: http://www.hands-on-optics.org/puzzl...b023979#submit


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  4. #3  
    Forum Cosmic Wizard icewendigo's Avatar
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    Thank You! Thats exactly it!





    Question: If you place a small candle in the saucer, you would see a candle on top, correct? But would it illumitate pretty much as if there was a candle at that level?
    (from the the top of the saucer up, since light would not shine down from the virtual flames position but only up from a given minimum angle [ex:5 degrees])?
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  5. #4  
    Forum Radioactive Isotope MagiMaster's Avatar
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    Light works the same both ways. From any angle you could see the floating candle, you'd see the light from it too.
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  6. #5  
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    Has anyone else seen this, and does anyone know what lense(mirror?) configuration was used?

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