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Focal length of thin converging lens
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[QUOTE="rude man, post: 5279194, member: 350494"] Well, you have a good point. A 'simple lens' could not change its focal length. However, in this problem it must, in order to keep a sharp image for different object distances s1 and s2. So your 'simple' lens has to be a 'zoom' lens. And I think the problem statement is wrong to call it a 'simple lens'. [URL]https://en.wikipedia.org/wiki/Zoom_lens[/URL] [/QUOTE]
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Focal length of thin converging lens
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