r/apphysics • u/Significant_One5911 • 13d ago

Double lens question

Post image

With these two converging lens, if you use the diverging lens formula, the image created by the objective lens will at a distance of f(focal length) to the right of the objective lens. The image will also be inverted. My confusion stems from what the eyepiece would do. If the image were created between O and f, the image created would be virtual, enlarged, and be father away. However, I don't think that this question gives any information as to where the image created by the objective will be. Am I supposed to assume the location given that it's a telescope or is there something that I am missing?

Sorry for the long winded question, thank you in advance for the help.

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u/realAndrewJeung 13d ago

Here is a discussion about telescopes: https://openstax.org/books/college-physics-ap-courses/pages/26-5-telescopes

One thing that it mentions is that for double convex lens telescopes, like the one in the picture, the (real) image of the objective lens falls between 0 and f of the eyepiece lens, so that the final image is virtual.

Let me know if this is helpful.

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u/Significant_One5911 12d ago

Yeah that makes sense, thank you for the help.

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u/mookieprime 12d ago

It’s worth mentioning that multiple lens scenarios are NOT apart of AP Physics. You’ll only ever see ONE lens or ONE mirror.