An electron make transition from higher energy orbit ( $\mathbf { n } _ { \mathbf { 2 } }$ ) to lower energy orbit ( $\mathbf { n } _ { \mathbf { 1 } }$ ) in $\mathbf { L i } ^ { \mathbf { + } \mathbf { 2 } }$ ion such that $\mathbf { n } _ { \mathbf { 1 } } + \mathbf { n } _ { \mathbf { 2 } } = \mathbf { 4 }$ \& $\mathbf { n } _ { \mathbf { 2 } } - \mathbf { n } _ { \mathbf { 1 } } = \mathbf { 2 }$. Determine the wavelength emitted in the dimension (in nm )\\
(A) 11.4 nm\\
(B) 12.9 nm\\
(C) 9.2 nm\\
(D) 16.7 nm