Eye and image

Having studied the structure of the eye in biology lessons, we can say that from the physical point of view, the eye looks most like a camera. The lens plays the role of an objective, the pupil is a diaphragm, and the retina, which forms an inverted reduced image of the subject under consideration, is a liquid crystal matrix.

Having studied the structure of the eye in biology lessons, we can say that from the physical point of view, the eye looks most like a camera

For example, the eye, like a camera, also needs to be sharpened. If you look through a transparent curtain, standing at 20-30 cm from it, on an object that is far behind it, it is easy to see that the curtain and the object can not be seen sharply at the same time.

The lens in the eye itself changes the focal length, depending on the distance to the object. At the same time a very sharp image is formed on the retina. If this does not happen, you have to wear glasses. Hyperopia is corrected by collecting lenses, nearsightedness is dispelled.

As in the camera, the human eye gives an inverted image on the retina, which can always be put on its feet. In humans, this work is carried out by the brain.

Let's do simple experiments. Close the left eye, and to the right one, as close as possible, let us bring a sheet of paper with a small hole made with a stud. Now put between the hole and the eye of the carnation cap, pointing it with the point down. But we will see it with an upside-down point... This is because, with a small distance, the actual image can no longer be obtained on the retina. A light passing through a hole throws a shadow from the carnation onto the retina. The shadow is oriented in the same way as the carnation. In consciousness, however, the picture obtained on the retina is automatically reversed. And then we see the shadow upside down.

If we bring the journal close to the eyes so that the text begins to blur, and then put our universal postcard between the text and the eye and look through the small hole on the font, then the letters will be seen enlarged in size. All because the hole serves as a diaphragm. At the boundary of the hole, the light is slightly refracted, the beam is deflected to the edges and the beam of light expands. That's why there is a small increase.

Why is trying to thread a needle, looking only with one eye, is completely inconclusive? What allows us to see three-dimensional, distinguish between close and distant objects, assess the speed of movement of objects relative to us? The answers to these questions can be found from the following experience. If, closing, alternately the right and left eyes, look at an object over the thumb of the outstretched hand, then the thumb will start jumping right and left. And all because each eye sees the thumb from different angles, and in our minds two independent images are formed that can be compared.

Hence the conclusion suggests: in life one always needs to look at both.

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