I have an exame question about huygens ocular lenses, and it is asked to determine the...

I have an exame question about huygens ocular lenses, and it is asked to determine the equivalent focal distance . And then asks me to determine and draw the position of the focal planes relativity to the vertices? Whats the difference between calculating the equivalent focal distance and the position of the focal planes? They provide f1 = 6,35 cm and f2= 2,5 cm, whcih I though it was the position of the focal planes so I dont get really the question. Also they provide the distance between the lenses which is d=4,5 cm?

Huygens ocular lenses is a combination of two thin lenses, and not thick lenses, right? I am asking these because in the same question, it is asked to draw (with rays)the position of the principal plane, prior to the object, which I dont understand either.

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genius_generous answered 1 year ago

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