Why is there is no +R effect in meta position of a phenol
Because +R is a resonance effect, and it includes the growth of electron density at orthro & para positions with respect to the species who is responsible for this effect. Since at para position, delocalised electrons are not there, the +R effect is not seen by the group present at that position.
Cause r effect is due to resonance and only at para nd ortho position resonance is operated
As because OH will activate the ring & will provide e density only on ortho and pera position