During non-cyclic photophosphorylation, when electrons are lost...

Photolysis of water: It is a light-mediated oxidation process associated with $PSII$ characterized by the splitting of a water molecules into electrons, hydrogen ions and oxygen. The electrons released during photolysis are accepted by $P680$ of $PSII$, which has lost its electron due to excitation. The ${H}^{+}$ ions released are used to reduce $NADP$ to$NADPH + {H}^{+}$ that enters the dark reaction of photosynthesis. The reaction is as follows:

$2{H}_{2}O\mathop{\to}_{{Mn}^{+ 2}, {Ca}^{+ 2}, {Cl}^{-}}^{Sunlinght}{O}_{2} + 4{H}^{+} + 4{e}^{-}$