Getting an image on the screen. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Getting an image on the screen. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Take a wooden box without a lid. Paint it inside with black paint. Instead of a lid, put frosted glass or stretch oiled paper. Drill a small hole in the bottom of the box in the middle. On a bright sunny day, put the box in the window. If the room is dark, you will see on the frosted glass an inverted image of distant objects, with their natural color.

In the camera, in place of the frosted glass, or directly on the film or plate, an inverted image is also obtained. In a camera, a lens produces an image.

Getting an image on the screen

Imaging through small apertures has been known for centuries. People also noticed the property of a magnifying glass - a loupe - to give images.

In 1570, an old book describes such a method: “It is necessary to close all windows so that there is not a single gap through which light could penetrate. But in one of the shutters it is necessary to make a round hole with a little finger in diameter and place lenticular glass near the hole If you hang paper or a white canvas against the glass, then all objects illuminated by the sun, which are and move on the street, will appear on the canvas as antipodes [upside down] and what is on the right side, then on the left ... You will also see the faces of people passing by , dresses, colors, movements - everything seems to be happening close by. The spectacle is so pleasant that one cannot be surprised. "

Fixing the resulting image on a special, photosensitive paper was achieved only at the beginning of the XNUMXth century.

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