What a hologram is and how to make it?
Source:There is a hypothesis that our universe is truly a hologram.
Light is an amazing form of energy that rushes through our world with the incredible speed of 300,000 kilometres per second — enough to fly from the Sun to Earth in just 8 minutes. We see the world around us because our eyes are sophisticated detectors of light: they constantly catch the light rays reflected from nearby objects, causing the brain can create ever-changing picture of the world. The only problem is that the brain is not able to maintain a permanent record of what the eyes see. We can remember what we thought we saw, and recognize patterns that we've seen in the past, but we can't easily recreate the image intact, as soon as they disappeared from view.
Can I save the ray of light.
How many holograms in your wallet? If you have some money, the answer will probably be: «pretty much.» the Hologram is with the ghostly images inside notes, which help fight counterfeiters as they are very difficult to reproduce. On credit cards also have a hologram. But what else can you use holograms?
In the 19th century, ingenious inventors have solved this problem, opening the way to capture and store images on chemically treated paper. Photography, as you know, revolutionized how we see the world and interact with it – and she gave us fantastic forms of entertainment in the 20th century in the form of movies and television. But no matter how realistic or artistic neither looked like the picture, the reality could not be and speeches. We look at a photograph and instantly see that the image is frozen history: the light that captured in the photo, disappeared a long time ago and can never be restored.
Hologram security on the banknote helps to stop counterfeiters – they are harder to play than other devices security.
What is a hologram?
The Hologram is a bit similar to the eternal photos. It is a kind of «photographic ghosts»: they that somehow got trapped inside a glass, plastic or metal. When you tilt a hologram, a credit card, see an image of something like a bird moving «inside» maps. How it gets there and what makes the hologram to move? How is it different from conventional photography?
Suppose you want to photograph an Apple. You hold the camera in front of you, and when you press the shutter button to take a picture, the camera lens briefly opens and allows light to reach the film (in an old-fashioned camera) or light-sensitive chip of the image sensor (the chip in your digital camera). All of the light emanating from Apple, comes from one direction and into one lens, so the camera can only record a two-dimensional pattern of light, dark and color.
Hologram elephant looks like
If you look at Apple, there is something more. The light is reflected from the surface of the Apple in both of your eyes, and the brain merges them into a single stereoscopic (three-dimensional) image. If you slightly turn your head, the light rays reflected from the Apple will move in slightly different trajectories, to meet your eyes, and part of an Apple now can look lighter, darker or even a different color. Your brain instantly recalculates everything and you see a somewhat different picture. with That's why the eyes see three-dimensional image.
A Hologram is a cross between what happens when you photograph, and what happens when you look at something really. As picture, a hologram is a permanent record of the reflected light from the object. But the program also looks real and three-dimensional and moving, when you look around it is exactly the same as the real object. This is due to the unique way that the holograms.
How to make a hologram?
To Create a hologram of you reflecting the laser beam from the object that you want to capture. In fact, you split the laser beam into two separate halves, prospecive it through political (a piece of glass coated with a thin layer of silver, so that half of the laser light is reflected and half passes through). One half of the beam is reflected from the mirror hits an object and is reflected onto the photographic plate inside which will create a hologram. This is called the object beam. The other half of the beam reflects off another mirror and hits on the same photographic plate. It is a reference beam. The hologram is formed where the two beams meet at the plate.
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