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The equation of a circle S1 is x^2 + y^2...

The equation of a circle `S_1` is `x^2 + y^2 = 1`. The orthogonal tangents to `S_1` meet at another circle `S_2` and the orthogonal tangents to `S_2` meet at the third circle `S_3`. Then (A) radius of `S_2 and S_1` are in ratio `1 : sqrt(2)` (B) radius of `S_2 and S_1` are in ratio `1 : 2` (C) the circles `S_1, S_2 and S_3` are concentric (D) none of these

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