I don't know why i can't detect by ray sth. tagged,

I am trying detect plane by ray but don't know why i can't

 RaycastHit hit;
 Ray ray = Camera.main.ScreenPointToRay (Input.mousePosition);
 if (Physics.Raycast (ray, out hit, 20)) 
     {
     Debug.Log (1);
 
     if (hit.collider.gameObject.name == "ciemnosc")
     Debug.Log (2);
                 
     if (hit.collider.gameObject.GetComponent<detect>() == true)
     Debug.Log (2);
 
     }

I never turn on Debug.Log (2), but always turn on Debug.Log(1)