Barry asked in Science & MathematicsPhysics · 2 months ago

A lens with f=+16cm is paired with a lens with f=−25cm. What is the focal length of the combination?

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  • 2 months ago
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    if these are 'thin' lenses and are touching

    1/f = 1/f1 + 1/f2

    I get about +44 cm

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