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Two thin lenses, with $f_{1}=+25.0 \mathrm{cm}$ and $f_{2}=-42.5 \mathrm{cm},$ areplaced in contact. What is the focal length of this combination?

60.7 $\mathrm{cm}$

Physics 103

Chapter 27

Optical lnstruments

Wave Optics

Rutgers, The State University of New Jersey

University of Washington

Simon Fraser University

Hope College

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Okay, so in this problem, we have to. Finland's is each one of them with one focal lens length. So the 1st 4 cold land is just 25. Same team enters, and the second focal land is just miners for a 2.5 ST Emitters. Okay, so the problem wants to know What is that? Total focal And of this truth England's has combined. So since their lances do not have a distance from each other, they are connected. We can use a formula to calculate the focal length that is just one divided by F ive course one divided by F one plus one, divided by F too. So we have been at the focal, the total focal and is just one divided by 25 plus one divided my minus 42.5. All this to the power of minor swine. And this is gives us a focal length off 60.7. Same team enters

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