The magnifying glass is on the carton and caused the fire. What is the principle of fire?

Science Fiction Network June 21 (Qin Yingying) Recently, a sudden fire suddenly caught fire in the home of a resident of Zhenjiang, Jiangsu. The reason for the fire was that the children in the family put it on the carton. Go to the scene in time. Fire reminder, do not put items such as magnifying glass under direct sunlight, which can easily cause fire.

The main role of magnifying glass is to magnify the perspective. Historically, it is said that the application of amplifying mirrors was proposed by a bishop in the 13th century Britain. As early as a thousand years ago, people have grinded transparent crystals or transparent gems into "lens". These lenses can magnify images, also known as convex lenses.

There are two ways to observe the objects with a magnifying glass. One is to let the magnifying glass approach the observation objects. The observation object does not move. The distance between the human eyes and the observation object is unchanged. The image is large and clear. The second is to get closer to the eyes. The magnifying glass is not moving, the moving object is clear until the image is large and clear.

In addition to zooming in images, the magnifying glass can also focus on the fire. Under strong light, the focus of the lens will be overwhelmed, and the focus part will be burnt or fire. The sunlight is parallel to the magnifying glass. The principle of lighting of the magnifying glasses will cause the light to be biased, and no longer spreads along the original dissemination direction. The effect of lighting up, when the temperature reaches the environmental temperature of combustible materials, the material will burn.

In addition, many problems in life are related to convex lenses. In the forest, if tourists discard the transparent round beverage bottle of water, it may cause a forest fire. This is because the water -filled drink bottle is equivalent to convex lens, which can make sunlight gather. It is best not to cover the plastic film on the grass dump. The plastic film after water accumulation is equivalent to convex lens. It has a gathering effect on the sun and is also flammable.

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