Question

what is invisble to the eye

Answer 1

air, wind is the resource which is invisible to the eye.

and our feeling like hate,love,kindness, loyality etc are also  invisible to the eye

Answer 2

atoms , thing which move more than (i dint know the no. of revolutions on which a human eye can see ) revolutions , rbc , wbc , microbes , and i would consider you to read about blind spots , becaoz i forgot details about it .