Two closely-spaced distant stars are just resolved when seen through a telescope with an objective lens of diameter D and focal length f. The separation between their images is given by.
(A) \(\cfrac D{1.22λf}\)
(B) \(\cfrac {fD}{1.22λ}\)
(C) \(\cfrac {1.22λf}D\)
(D) \(\cfrac {1.22Dλ}f\)
