This is tiresome. There cannot be any projected holograms, because holograms are not real images. They are virtual images, like the reflection in a mirror. You cannot see them outside the frame of the hologram (which is the photograph of the interference pattern that generates the image).
This is tiresome. There cannot be any projected holograms, because holograms are not real images. They are virtual images, like the reflection in a mirror. You cannot see them outside the frame of the hologram (which is the photograph of the interference pattern that generates the image).
Don't get your understanding of holograms from "Star Trek." Read the book by their inventor, Dennis Gabor. https://en.wikipedia.org/wiki/Dennis_Gabor