a) Write the expression for optical distance used in the derivation of Eq. (5.118).

b) Eq. (5.118) has been derived for the condition that region \(\mathrm{i}\mathrm{j}\) ? How will the expression of optical distance differ from the one in (a).

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2 - Pji = dy [(Kis(t) Kia (ti; +t;) Ki (ti; +t;) + Ki (ti; +t; +t;)) Vi - - +(Kis (t) Kis (55 +71) Kis (75 +1,) + Kia (tj + x; + x))] i) (5.118)