Help with LineRenderer

Just cast a ray of the same length and direction of your line renderer.

Here's an example (just attach it to your desired gameObject):

 public class Test : MonoBehaviour
 {
     public float length = 10;

     LineRenderer line;
     Transform mTransform; // cached transform

     void Start()
     {
         line = GetComponent<LineRenderer>();
         if (!line)
            line = gameObject.AddComponent<LineRenderer>();

         mTransform = transform;

         line.SetVertexCount(2);
         line.SetWidth(.1f, .1f);
     }

     void Update()
     {
         // set the positions of the line's two vertices
         line.SetPosition(0, mTransform.position);
         line.SetPosition(1, mTransform.position + mTransform.forward * length);

         // create a cast a ray from our position, going forward and of length 'length'
         Ray ray = new Ray(mTransform.position, mTransform.forward);
         RaycastHit hit;
         if (Physics.Raycast(ray, out hit, length)) {
            print(hit.collider.name);
         }
     }
 }

Result: