Deceptive vision. Effective trick and its solution

EFFECTIVE FOCUSES AND THEIR CLUES
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Deceptive vision. Focus secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Focus Description:

There is a chair in front of the audience (with its back to the audience) and an empty table. You make a "magical" movement with your hands, and a vase of flowers appears on the table, or a small figurine, or a portrait of someone present. Then you move away to the audience, say a "magic" spell, and the objects disappear.

Focus secret:

You will need a chair covered with black cloth, a table and rectangular glass. Glass is attached to the table with cords so that it is in an inclined position with respect to the chair (Fig. a). Place a chair in front of the table at a distance of one meter.

Focus Deceptive Vision

The secret of focus is in the properties of glass to reflect objects. On the seat of the chair, place the object that you will demonstrate to the audience. Your assistant sits in advance under the table with a lit candle in his hands. When illuminated by a candle, an object placed on the black fabric of a chair will immediately be reflected on the glass, and the audience will see it standing on the table (Fig. b).

Focus Deceptive Vision

It is necessary first to set all objects very accurately relative to each other - a table, a chair, glass, a vase of flowers - so that the reflection appears on the table. Only in this case, the audience will have a complete illusion. When the assistant removes the candle, the object will instantly disappear from the table.

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Random news from the Archive

A new property of light has been discovered 02.07.2019

Scientists from Spain and the USA have discovered a new property of light that was not even predicted before. They received a beam of light with a time-varying rotation. The new property is called intrinsic torque.

The fact that light can twist was discovered in 1995. In this case, the light wave is similar to a corkscrew, twisted around the direction of propagation. Such a light beam is also called a vortex. Physicists say it has orbital angular momentum. This property of light has found applications in optical communications, microscopy, quantum optics, and the manipulation of microparticles. However, all the vortex rays received up to this point were static, that is, did not change in time.

The authors of this work obtained a light beam with a turn that changes with time. They compared it to a whirlpool that speeds up the rotation. Most importantly, the change in rotation was not due to any effect on the light. He changed the speed of rotation himself, without outside help.

In the experiment, the researchers passed overlapping pulses of swirling light from two ultraviolet lasers through a cloud of argon gas. As a result of the interaction, a combined vortex beam was obtained at the exit from the cloud. It turned out that if the pulses have different orbital momentum and a small delay relative to each other, then the output beam has a time-varying rotation, which can be controlled by changing the delay time. The intensity of this beam in cross section has the shape of a crescent.

At high values of the orbital momentum of the incident pulses, the time of change in the orbital momentum of the resulting beam is much less than the pulse length and has a femtosecond (10^-15 s) scale. In the future, such vortex beams can be used for ultrafast control of nanostructures and atoms. Perhaps they will open new directions for the use of light in optical communications and quantum optics.

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