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What is the minimun lens size (in meters) that will permit just resolving 2 stars 1.1 seconds apart using light of 510 nm?

For a slit of width a, light of wavelength L, the first minimun occurs at an angle t from the center, assume a slit shaped lens! E=E max L* sin(pi a sin(t)/L)/(pi a sin(t) )

Hint: you don't really need all of this. Resolution implies that the maximun of one image falls on the minimun of the other.

I have really no clue on how to this please help!

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