1. This scattered light is combined with the reference beam at the photo-detector. 2. The second and third beams are modified versions of the reference beam . 3. These methods measure the variations in interference with a reference beam . 4. The developed hologram is illuminated by a beam similar to the original reference beam . 5. It must match the original reference beam angle exactly. 6. To visualise this effect, the image and reference beams are combined on a video camera and recorded. 7. The detector alternates between measuring the sample beam and the reference beam in synchronism with the chopper. 8. A double path interferometer is one in which the reference beam and sample beam travel along divergent paths. 9. The transmission and the hole size are selected to balance the intensities of the test and reference beams . 10. When the developed plate is illuminated by the reference beam , the light transmitted through the plate, "'U "'
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