The real image of a luminous point is obtained at a dis

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The real image of a luminous point is obtained at a distance of 8 cm from the lens at a distance of 2 cm below the main optical axis. The focal length of the lens of 5 cm, the radius of 5 cm. At some distance in front of the lens you need to put a screen in the shape of the upper half of the lens to the image point has disappeared?

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Task 40828. The solution formulas and the laws of recording used in the decision, drawing, calculation formula and the withdrawal response.
If you have any questions about the decision to write. I try to help.


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