The equation Im $\left( {{{iz - 2} \over {z - i}}} \right)$ + 1 = 0, z $ \in $ C, z $ \ne $ i represents a part of a circle having radius equal to :

Question

The equation
Im $\left( {{{iz - 2} \over {z - i}}} \right)$ + 1 = 0, z $ \in $ C, z $ \ne $ i
represents a part of a circle having radius equal to :

${3 \over 4}$

${1 \over 2}$

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