Answer to Question #186953 in Optics for Izzy

Question #186953

Two thin lenses are in contact and object is placed at 60cm from the lens. It forms a real image at a distance of 35cm from the lens. one of the lenses is converging with the focal.length of 20cm.complete or determine the nature and the total length of the second lens.


1
Expert's answer
2021-04-30T11:26:51-0400

1F1+1F2=1f+1d,\frac{1}{F_1}+\frac{1}{F_2}=\frac 1 f+\frac 1d,

F1=20, d=60, f=35,    F_1=20,~d=60,~f=35,\implies

F2=210 cm,F_2=-210~cm, concave.


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