Ray is not being detected

Hello, Actually we are trying to hit an object with a ray. In output it is detecting an object but we cant see the ray. Can someone help us in fixing this/ Here is the code attached: using UnityEngine; using System.Collections;

public class Raycast : MonoBehaviour {

 // Use this for initialization
 void Start()
 {

 }

 // Update is called once per frame
 void Update()
 {

     if (Input.GetMouseButtonDown(0))
     {
         Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
         RaycastHit hitinfo;
         

        if (Physics.Raycast(ray, out hitinfo, 100f))
         {
             Debug.Log("collission detected" + hitinfo.collider.name);
             Debug.DrawLine(ray.direction, hitinfo.point);

         }
     }
 }

}