The imaging law of cylindrical lens is explained in detail. Lenses are divided into convex lens and concave lens. The cylindrical lens mentioned here can actually be classified as a kind of convex lens. Therefore, the imaging law of cylindrical lens and the principle of convex lens should be the same. I can learn more about it later. First, I can take a water bottle full of water for an experiment. The imaging law of the convex lens is: when the object distance is within one focal length, an upright and enlarged virtual image is obtained; when the focal length is between one and two times the focal length is obtained, an inverted and enlarged real image is obtained; when the object distance is outside the double focal length, it is obtained Inverted, reduced real image.

The water bottle experiment is to research and confirm this law. In the experiment, we can look at the following figure to understand the law of convex lens imaging:

We can use an example to make everyone understand more clearly.

As shown in the picture, a doll is placed behind the cylindrical glass water cup, and the doll’s image can be observed through the water cup. As the clay doll is gradually approached to the water cup, the height of the clay doll will be ______ (Unchanged/changed), the thickness will be ______ (unchanged/changed).

Analysis:

The image of the doll can be observed through the water cup. When the doll is gradually approaching the water cup, the law of imaging by the convex lens shows that when the object distance is within one focal length, an upright, enlarged virtual image is obtained;

Because the water cup is a convex lens, when the doll is gradually approaching the water cup, the object distance decreases and the image becomes smaller. Because the left and right edges of the lens formed by the water cup are thinner than the middle, and the upper and lower edges are the same as the middle, so look The height of the idol will not change; the puppet will become fat, that is, the thickness will change.

he lens of a camera is a convex lens, the scene to be photographed is the object, and the film is the screen. The light irradiated on the object is diffusely reflected through the convex lens to form the image of the object on the final film; the film is coated with a layer of light-sensitive material, which undergoes chemical changes after exposure, and the image of the object is recorded on the film. The relationship between the object distance and the image distance is exactly the same as that of the convex lens. When the object gets closer, the image gets farther and bigger, and finally becomes a virtual image on the same side. As the object distance increases, the image distance decreases, and the image becomes smaller; the object distance decreases, and the image distance increases, and the image becomes larger. One-time focal length is divided into virtual and real, and two-time focal length is divided into size.

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