Optical lenses The law of convex lens imaging is: the object is placed outside the focus, on the other side of the convex lens into an inverted solid image, the solid image has a reduced, isosceles, magnification of three kinds. The smaller the object distance, the larger the image distance, the larger the real image. The object is placed in the focus, in the same side of the convex lens into a positive magnified virtual image. The larger the object distance, the larger the image distance, the larger the virtual image. Concave lenses diffuse light, and their imaging laws are much more complex.

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