Fig. 3: Comparison of the variation of \({\tilde{F}}_{C}\) with \({\tilde{k}}_{i}\) using exact (equation (27)-dimensionless form) and approximate (equation (2)) expressions of \({\tilde{F}}_{C}\) in the black and red dashed curve respectively.

The blue curves illustrates the variation in transmission coefficient (T). The approximate value of optimum \({\tilde{F}}_{C}\) agrees well with the exact value near the optimum region. Here, \(\tilde{d}=80\) and \(\tilde{a}\to 0\).