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Solving a problem in physics section 36 point 15 optics

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15. The lens is located on the optical bench between the lamp and the screen, the screen gives a sharp increase in the light bulb. When the lens is moved 40 cm closer to the screen, it appeared sharp decrease of the light bulb. The focal length f of the lens, if the distance from the light bulb to the screen is 80 cm.
Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)
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