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Do convex lenses converge light? Are concave lenses all divergent?
When the object is located in the focus of the convex lens, that is, the object distance u.

It can be discussed according to the imaging formula of the lens:1/f = (1/u)+(1/v). In this formula, if it is a convex lens, f takes a positive value. If it is a concave lens, f takes a negative value; When the image distance is positive, it means it is a real image; When the image distance is negative, it means a virtual image.

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