Periscope. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Periscope. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

The operation of a number of optical instruments is based on the laws of light reflection. Man has long noticed that by taking the sun's rays on a mirror, you can get a spot of light. Turning the mirror changes the position of the bunny. The laws of reflection from a flat mirror were found: the incident and reflected rays lie in the same plane with the perpendicular restored at the point of incidence; the angle of incidence is equal to the angle of reflection.

To understand the operation and device of the periscope, take a hand mirror, place it at eye level and turn it in different directions. With each turn of the mirror, the view of the area will also change. You will be able, without turning your head, to see everything that happens behind you, from above, below, from the side. Of course, you have seen such devices on cars and buses. The driver looks only forward, but sees everything that is done behind and to the side.

For a periscope, you will need two round or square mirrors. For mirrors, make a tube of the appropriate shape from thick cardboard or thin plywood. If the tube is square, put wooden slats in the corners, on which glue and attach the side walls. The length of the tube can be from 500 mm. At the ends of the tube, obliquely at an angle of 45 °, parallel to each other, place and secure your mirrors. The beam of light, reflected from the upper mirror, goes down, reflects from the lower mirror and goes out, parallel to the original direction. Make a round or square hole exactly against the center of each mirror. Attach the mirrors to blocks nailed to the back and front walls or to recesses made in these walls.

Periscope

Paste the inner surface of the periscope tube with black paper or paint with black paint or ink. The ends of the pipe must be closed. Light should only fall on the mirrors through holes made against the center of each mirror. To protect your eyes from reflected sunlight, attach a tin visor to the top hole. If you paint the device with waterproof paint, covering all the cracks and grooves with it, it can be used not only for observation from behind a shelter, but also for observation under water. To do this, immerse one end of the periscope in water and observe through the top hole.

We recommend interesting experiments in physics:

▪ outsmart inertia

▪ stick scales

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Three years under the gaze of TV cameras 24.09.2008

The first phase of an unusual experiment that began in June 2005 has ended.

Deb Roy, professor at the Massachusetts Institute of Technology (USA), explores the process of language acquisition by a child. To do this, with the consent of his wife, a speech pathologist, before the birth of his son, Deb provided their home in Boston with a system for a complete recording of everything that would happen to a child from birth for three years.

Eleven video cameras with ultra wide-angle lenses and 14 microphones are scattered throughout the house and continuously record from the moment the boy wakes up to the time he goes to bed. Each room has a button on the wall that allows you to interrupt the recording and even erase the last few minutes in case any too intimate scenes get into the lens.

Everything captured by cameras and microphones was transmitted over the network (the total length of the cables is about a kilometer) to the basement, where there are computers with a memory capacity of 5 terabytes. The installed equipment quadrupled the electricity bill.

By the third birthday of the child, 400 hours of video and sound recording have been accumulated. Now they will be analyzed by a supercomputer to reveal how a child learns to speak in interaction with adults. True, Roy's son spent about 15% of the time outside the house, on walks, and this period eluded the record.

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Biobiosn
All the materials necessary for the experiments can be easily found at home or bought inexpensively, and the experiments offered are simple and safe. Forward!

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