In an imperfect lens L, all the rays do not pass through a focal point. The smallest circle that they pass through C is called the circle of least confusion.

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An eyepiece is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes.
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In an imperfect lens L, all the rays do not pass through a focal point. The smallest circle that they pass through C is called the circle of least confusion.
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https://en.wikipedia.org/wiki/Circle_of_confusion
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Convex lens circle of confusion
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Chetvorno
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