Broken pencil. Effective trick and its solution

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EFFECTIVE FOCUSES AND THEIR CLUES
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Broken pencil. Focus Secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

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Focus Description:

This experience is based on the properties of water and light.

Props:

- cup;
- tap water;
- pencil

Preparation:

1. Fill a glass approximately 2/3 full with tap water.

2. Place a glass of water and a pencil on the table.

Let's start the science magic:

1. Hold a pencil in front of you. Announce to the audience: "Now I will break a pencil just by putting it in a glass of water."

2. Dip the pencil vertically into the water so that its tip is approximately halfway between the bottom of the glass and the surface of the water.

3. Hold the pencil at the back of the glass, away from the audience.

4. Move the pencil back and forth in the water, holding it vertically. Ask the audience what they see.

5. Get the pencil out of the water.

Result:

Viewers will think that the pencil is broken. From their point of view, the part of the pencil that is under water is slightly offset from the part that is under water.

Focus secret:

This effect is due to refraction. Light travels in a straight line, but when a beam of light passes from one transparent substance to another, its direction changes. This is refraction. When light passes from a denser substance, such as water, to a less dense one, such as air, refraction occurs, or a visible change in the angle of incidence of the beam. Light in substances of different densities propagates at different speeds.

The light reflected from the pencil, passing through the air, seems to the audience to be in one place, and through the water - in another.

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