Conceptual Question

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Hi guys I am a engineering student(in my 4th semester). I was having trouble with the following question. Kindly tell me how to approach and solve this question. Also please tell me some nice online resources that i can use to study this topic because I think I am weak in it currently. The question is: Find a suitable linear fractional transformation to study potential for a region (in the form of lense) common between two circles of radius 1 centered at 1 and i and kept at constant potential Φ = 1 and Φ = 0, respectively.