A Refracting Telescope With A Lens Whose Diameter Is 300

A refracting telescope with a lens whose diameter is 30.0 cm is used to view a binary star system that emits light in the visible region.
(a) What is the minimum angular separation of the two stars for them to be barely resolved?
(b) If the binary star is a distance of 6.00 x 1020 km from the Earth, what is the distance between the two stars? (Assume that a line joining the stars is perpendicular to our line of sight.)

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