Solution

Both Derry and Mr Lamb suffer from physical impairment. Derry has one side of his face disfigured and burnt by acid. The old man has a tin leg because his real leg got blown off during the war. Apart from these physical disabilities, Derry finds signs of loneliness and disappointment in Mr Lamb’s life. The old man tries to overcome these feelings but the sense of alienation felt by him is more painful than the pain caused by physical disability.