The length of the chord of the ellipse $\frac { x ^ { 2 } } { 4 } + \frac { y ^ { 2 } } { 2 } = 1$, whose mid-point is $\left( 1 , \frac { 1 } { 2 } \right)$, is :\\
(1) $\frac { 5 } { 3 } \sqrt { 15 }$\\
(2) $\frac { 1 } { 3 } \sqrt { 15 }$\\
(3) $\frac { 2 } { 3 } \sqrt { 15 }$\\
(4) $\sqrt { 15 }$