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Ray Optics: Minimum diameter of eye lens in a telescope.

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A 20X telescope has a 12cm diameter objective lens.
What minimum diameter must the eyepiece lens have to collect all the light rays from an on-axis distant source?

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Minimum diameter of eye lens in a telescope is calculated to get all rays from objective.

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Optical systems that magnify
A 20X telescope has a 12cm diameter objective lens.
What minimum diameter must the eyepiece lens have to collect all the light rays from an on-axis distant source?

"I guess they want us to use the minimum spot ...

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