@Math Easy Solutions basically yes, but the key reason isn’t “more standing waves” in a generic sense — it’s that the Denisyuk setup puts the plate where the object wave and incoming reference wave overlap in opposite directions, which records very fine volume interference layers inside the emulsion. Those layers behave like Bragg-selective reflectors, so during replay they can reconstruct the image under white light by reflecting the right wavelengths/angles while rejecting most others. So yes, the plate is between beam and object because that geometry creates the right internal fringe structure for white-light reflection holograms, not merely because it “captures more” waves. Also, your own MES hologram thread was asking exactly the right thing.