
Fuzzy-Wuzzy |
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Not sure about the incorporeal question, but a definite No on the ethereal question.
Game Mastery Guide wrote:
Spells function normally on the Ethereal Plane, though they do not cross into the Material Plane. The only exceptions are spells and spell-like abilities that have the force descriptor and abjuration spells that affect ethereal beings; these can cross from the Material Plane to the Ethereal Plane. Spellcasters on the Material Plane must have some way to detect foes on the Ethereal Plane before targeting them with force-based spells. While it's possible to hit ethereal enemies with a force spell cast on the Material Plane, the reverse isn't possible. No magical attacks cross from the Ethereal Plane to the Material Plane, including force attacks.