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The lunar lander is about 7 m wide. How large must a space-based telescope's primary be...

The lunar lander is about 7 m wide. How large must a space-based telescope's primary be to resolve the 2 sides of the lander?
That is, the separation of the 'objects' is 7 m. Take the wavelength as the shortest visible wavelength (400 nm), and take the distance from telescope to objects to be the distance of closest approach for the Earth and moon.
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