Why does a magnifying glass burn things???

Well, the magnifying glass, also known as the convex lens, is actually a piece of glass with a thick middle and thin edges, when the sunlight passes through the glass, it will be refracted when the sunlight passes through the glass, because the thickness of the glass is different, so the refractive angle is not the same, after the light passes through the magnifying glass, it will converge at a certain point behind the mirror, which is called focus, because light is a substance with energy, and the temperature must be high, and it is normal to burn things.

You should know that light has heat energy (heat is called heat energy), because magnifying glasses are made of lenses (convex lenses) and other materials (such as frames). When the sunlight hits the magnifying glass, the light begins to converge into a point (i.e., a point that will burn).

So it can be burned.

The principle is to use the principle of convex lens with thick middle and thin on both sides, which is actually the principle of light dispersal, to change the direction of light, so that the entire equal light shining on the lens is concentrated at a small point. That is, the energy of the entire lens is concentrated at one point, so that the temperature increases.

Focusing principle. When all the energy that can be received by the magnifying glass is gathered at one point, the object receives a large amount of energy and the molecules begin to move violently, and after reaching a certain level, they begin to burn.

The sun radiates heat, and when the heat gathers at one point, it creates a high temperature that burns the paper!!

Because magnifying glasses are convex lenses, they converge light. Parallel rays pass through a convex lens, and the light rays converge at the focal point of the convex lens, and under strong light, the focal point of the lens will be particularly violent, and the focal part will zoom or catch fire.

In order to see tiny objects or details of objects, it is necessary to move the object closer to the eye, which can increase the angle of view and create a large real image on the retina. But when the object is too close to the eye, it is impossible to see clearly.

The angle cannot be magnified with a magnifying glass, because the angle is determined by the intersection of two straight lines, and the magnifying glass can only magnify the object but cannot change the position of the straight line. A magnifying glass is a convex lens used to magnify an object, usually used to observe the details of the object. The main function of the magnifying glass is to magnify the image of the object, put the magnifying glass in front of the object at an appropriate distance to be magnified from the lens** image, pay attention to the object is not actually magnified.

The secondary function of the magnifying glass is to focus on the fire, under strong light, the focus of the lens will be particularly violent, and the focus part will zoom or catch fire. The combination of the two magnifying glasses can increase the magnification of the object. Magnifiers can be classified according to their appearance and can be divided into portable magnifiers and desktop magnifiers.

The shape of the magnifying glass can be rectangular or square, or round.

Angle. Because the angle is determined by the intersection of two straight lines, the magnifying glass can only magnify the object but cannot change the position of the straight line. For example, an equilateral triangle with a side length of 1 cm, each angle is 60 degrees, and in a magnifying glass, the triangle has indeed become larger, and it has become an equilateral triangle with a side length of 5 cm, but each angle is still 60 degrees.

Angle. Because the angle is determined by the intersection of the two straight lines, the magnifying glass can only magnify the Qingling body but cannot change the position of the straight line. For example, an equilateral triangle with a side length of 1 cm, each angle is 60 degrees, and in a magnifying glass, the triangle does become larger, becoming an equilateral triangle with a side length of 5 cm, but the rhetoric is still 60 degrees per angle.