The ratio of the bend to splay elastic constant of a binary liquid crystalline mixture (5CB/ME60.5) which show injected smectic phase, has been determined by Freedericksz transition in nematic phase, results of which have been reported here. It has been found that K-3/K-1 values show a divergence as the injected smectic phase is approached. The K-3/K-1 values also show a minimum near equimolar concentration, which is similar to the minimum in other physical properties of this mixture at this concentration found by previous workers.