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Old Oct 27th 2013, 06:04 AM   #1
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How to guide lights from all direction, straight and perpendicular to a surface?

hi,
I am working on a college project, and I was wondering if there is any kind of lens or something that can get light from any direction within any angle of incident and bend it so that the plane below it, can get those light rays in a straight and perpendicular fashion. in order to illustrate what I mean, I have attached two images. those thin lines are light rays!
thanks
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How to guide lights from all direction, straight and perpendicular to a surface?-1.png   How to guide lights from all direction, straight and perpendicular to a surface?-2.png  

Last edited by JJoll; Oct 27th 2013 at 06:06 AM. Reason: attaching pictures
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Old Oct 29th 2013, 09:35 AM   #2
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A double concave lens might work:
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Old Oct 30th 2013, 01:24 PM   #3
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Feasible, or Fantasy?

My initial thought on your post was no, it can't be done.
A single lens (as described by ChipB) will work for a single set of incident angles,
but not for all angles (as described in your post).
However, I then remembered a hologram exhibition I once saw,
From this exhibition I remember a hologram of a lens, that worked as a lens,
there were also holograms that showed different images when viewed from different angles.
Extrapolating these two ideas I wonder if it might be possible to create a hologram which will work as different lenses when viewed from different angles.
If the appropriate lens could be holographically represented for each angle then maybe this could produce the effect you are after.
I may be (as tends to be my wont) extrapolating a small amount of knowledge way beyond the practical bounds of reality.
Perhaps there is a hologram expert out there who can indicate if this is feasible?
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Old Oct 30th 2013, 03:49 PM   #4
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I'm going with "can't be done" for a lens...you would need a different lens for each possible source you had. You might be able to do something more "mechanical" though. A sheet of polarizing film (or crystal) ought to do the trick.

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Old Nov 14th 2013, 04:12 AM   #5
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A double concave lens would work to some extent as suggested by Chip, but not for all angles. If you face the lens he has shown from the right sources on a circle formed by the emerging rays would do so. Light from other angles would also enter, but wont be parallel to the axis.
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