A point light source is located on the main optical

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Uploaded: 04.03.2016
Content: 40808.PNG (26,89 kB)
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Description

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.

Additional information

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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