1.
设向量\( \overrightarrow{a}=(λ+2,λ^{2}- \sqrt {3}\cos 2α)\),\( \overrightarrow{b}=(m, \dfrac {m}{2}+\sin α\cos α)\)其中\(λ\),\(m\),\(α\)为实数.
\((\)Ⅰ\()\)若\(α= \dfrac {π}{12}\),且\( \overrightarrow{a}⊥ \overrightarrow{b}\),求\(m\)的取值范围;
\((\)Ⅱ\()\)若\( \overrightarrow{a}=2 \overrightarrow{b}\),求\( \dfrac {λ}{m}\)的取值范围.