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Old 07-02-2009   #8 (permalink)
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Re: Holography

Quote:
Originally Posted by lemit View Post
So I don't get to find out how the Hideo-Cyber Slamotron works?
--lemit
Some day, Lemit. When you're older.

John, I have a question for you. I know in principal how a hologram is made. I also know that in the F-16 Falcon fighter there is a Heads Up Display (HUD) so the pilot can look straight ahead out the cockpit and see his navigation "tell-tales" floating out there.
However, to achieve this, the engineers originally needed a very large lens (say, a foot across) with a very short focal length (a thick lens) to bring the tell-tales into focus at infinity.
There was no room for a big thick lens.
So, they made a hologram of the big thick lens.
The hologram (as I understand it) is a thin plastic film that is stuck to the cockpit glass in front of the pilot's face.
And SOMEHOW, this hologram of a lens is made to function EXACTLY like a REAL LENS.

How do they do that??


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