One of my players is interested in using Arcane Eye and Fireball in conjunction. From looking at this thread here:
Area spells and line of sight, it seems that if a player cannot SEE the target, then the Fireball will explode on whichever obstruction is in its way. However, that's an AND condition, specifically.
So, what happens if a Wizard uses Arcane Eye to peer at the other side of a solid wall. Can they cast Fireball on that spot?
RAW, they can. My original argument was that RAI, it can't, since the Fireball's 'streak of light' hits a solid obstruction and explodes. However, the PHB does explicitly say 'can see' rather than using wording such as having a line of sight or an unobstructed path.
Best Answer
The fireball will explode on the caster's side of the wall
There is no requirement that the caster see the target area (the spell does not specify "that you can see") but there is nothing in the spell that overrides the general rule that there must be a clear path from caster to target.
From the PHB: