A point light source is located on the main optical

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A point light source is located on the main optical axis of the lens at a distance of 25 cm from it. The focal length of the lens 10 cm, the radius of 5 cm. On the other side of the lens put the screen so that it is obtained a clear image of the source. Then the screen is moved along the axis at a distance of 5 cm. Find the radius of the circle of light on the screen.

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Task 40808. The solution formulas and the laws used in the decision, the withdrawal of the calculation formula and the answer.
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