Raycasting to find mouseclick on Object in unity 2d games

I am trying to delete the object on which the mouse is clicked. I am making a 2D game using the new Unity3D 4.3. Here is the code I'm using

void Update () {

    if (Input.GetMouseButtonDown(0)) 
    {
        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        RaycastHit hit;
        if(Physics.Raycast(ray,out hit))
        {
            isHit = false;
            Destroy(GameObject.Find(hit.collider.gameObject.name));

        }
    }

}

The control is not entering the inner if loop. (isHit is not being set as false).