2d raycast from finger touch code example

Example: unity 2d raycast mouse

// detect object that was clicked using raycast

RaycastHit2D hit = Physics2D.Raycast(Camera.main.ScreenToWorldPoint(Input.mousePosition), Vector2.zero);
 
if(hit.collider != null)
{
    Debug.Log ("Target name: " + hit.collider.name);
}