I understand the principles behind recording the holograph, that we are using interference to record phase information as well as the usual intensity. What I don't understand is how recording this information enables us to reproduce a 3-Dimensional image. So far I've reasoned that the only visual cue that could be tricking the brain into 'seeing' a 3D object is stereopsis. This would require, I think, that by recording an interference pattern we are actually recording more than one image of the object in our film. Therefore the effect of the hologram on light passing through it must depend on the angle of incidence. I'm not sure about this bit, I don't quite understand why the image perceived by each eye is different. Actually, the more I think about this, the more I sort of get a feel for why it is happening. I ask because I'll be making transmission and reflection holograms in undergrad labs this week. I'm not expected to understand the maths, its supposed to be a qualitative report, but I know I'm going to go nuts trying to understand this. My lab book has a couple of lines of maths regarding transmission functions, but its been taken from a book I don't easily have access to, and its not really in any sort of context. Anyway, the point of this post: There are plenty of sites explaining how holographs are recorded, but I can't find any that explain how they recreate a 3D object. Does anyone know of a source that gives a proper mathematical description of holographs?