Spell Compendium says on page 5 that minor reflection has been renamed ray deflection.
Where was the spell originally published as minor reflection?
The only source I can find for a spell named “minor reflection” is Dragon Annual #5, an extremely obscure source. Most of the stats and text for minor reflection are word-for-word identical to Spell Compendium’s ray deflection, with a few changes—some of them massive:
In all other respects, the two are entirely identical.
Between being a spell level lower, and actually retaliating upon your attacker instead of “just” protecting you, minor reflection is a vastly superior spell. This is a problem, because ray deflection is, even with these nerfs, already one of the most powerful and popular defensive options in 3.5e.