Spoiler

Watch this YouTube video 'How are holograms possible? (3Blue1Brown)'

 

 

https://www.youtube.com/watch?v=EmKQsSDlaa4

Now;

 

What on Earth would happen if this was done on an ongoing Double-Slit experiment apparatus?

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This short animation shows how one type of hologram (transmission holograms) is created using lasers, lenses, and holographic film.

 

Once the Mushroom is removed, the film inside  the Glass retains the 3D image of the Mushroom. Even when you move your head up and down.

 

Edit:- As in; You could lift the Glass off the Table and the (Removed) Mushroom can still be seen.

Edited January 29Jan 29 by HawkII

4 hours ago, HawkII said:

Once the Mushroom is removed, the film inside  the Glass retains the 3D image of the Mushroom. Even when you move your head up and down.

The reason for this is that you have recorded the phase difference of the two beams. 

In a double-slit, the phase difference at a given point is fixed. The two situations don’t seem to be compatible.

9 hours ago, swansont said:

In a double-slit, the phase difference at a given point is fixed.

But that's the most exciting part. In a Double-Slit experiment, conventional wisdom tells us it knows it's being observed.

20 minutes ago, HawkII said:

conventional wisdom tells us it knows it's being observed.

...are you sure?

 

3 hours ago, HawkII said:

But that's the most exciting part. In a Double-Slit experiment, conventional wisdom tells us it knows it's being observed.

You have to be more specific, and accurate, in your descriptions. You mean a which-path experiment, which is also not compatible with a hologram if the photon only travels one path. There would be no interference if you know the path. No interference, no hologram.