Shin Okada
Explorer
OK I found the answer, a kind of. It is in P.86 of the Complete Arcane.
But Infiniti2000's question still remains. All the rays from a Scorching Ray spells fired simultaneously. And can target different opponents. But that will be the case when I "choose" which ray to be the 1st one, I guess.
Multiple Hits
Some weaponlike spells can strike multiple times in the same round. When the caster gets a bonus on damage with such spells (including sneak attack damage), the extra damage applies only to the first attack, whether that attack hits or not.
But Infiniti2000's question still remains. All the rays from a Scorching Ray spells fired simultaneously. And can target different opponents. But that will be the case when I "choose" which ray to be the 1st one, I guess.