My point is that while you can see the full subject you get it from the exact same point of view as that part of the hologram before it was chopped up.
If you couldn't see part of the subject from part of the intact plate you won't be able to after either.
The phrasing you used, "two copies of the hologram" is very misleading in the same way that my Usborne book was.
Chopping a hologram in half gives you two copies of the hologram in exactly the same sense that chopping a photo in half gives you two copies of the photo.
In both cases what you can see from that part of the plate/print is the same before and after you chop it up.
My point is that while you can see the full subject you get it from the exact same point of view as that part of the hologram before it was chopped up.
If you couldn't see part of the subject from part of the intact plate you won't be able to after either.
The phrasing you used, "two copies of the hologram" is very misleading in the same way that my Usborne book was.
Chopping a hologram in half gives you two copies of the hologram in exactly the same sense that chopping a photo in half gives you two copies of the photo.
In both cases what you can see from that part of the plate/print is the same before and after you chop it up.