Traditional Culture Encyclopedia - Photography major - What are the precautions for completing holographic experiment?

What are the precautions for completing holographic experiment?

1. Stereo, you can see places that you couldn't see before from another observation angle. 2. There should be no change except the brightness change of the image. You can still see the whole image, but the brightness is not as bright as before. By moving the position of the small hole, you can see images from different angles. 4. Compare yourself.