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light does not behave like water. if you pour water into something, it stays there. Light only travels in straight lines and will either bounce straight out of whatever you put it in or will be absorbed somewhere in the container - it doesn't "stay" anywhere. For example a photon that was near you only 2 seconds ago could now be out the other side of the moon and heading for some far off galaxy - and that same photon will probably get there.
Adding a funnel on the end of a telescope will certainly increase the total amount of light which is collected, but none of it will be coming from the right directions to contribute to an image - it will be scattered around and back out, or it will be absorbed inside the scope to heat it very slightly.
The idea of adding a funnel has application in solar heating, where a funnel shaped parabolic concentrator can be used to direct light onto a non-directional absorber.
Last edited by Shiraz; 16-05-2014 at 01:51 PM.
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