<prompt> Laryngeal mirror is warmed before use by placing:Glass surface on flameBack of mirror on flameWhole mirror into flameMirror in boiling water  <response>: a Glass surface on flameRef. Dhingra, 6th ed., 384Laryngeal mirror is warmed before use by placing the glass surface on flame to prevent fogging caused due to breathing.Putting back of mirror on flame or will heat its back surface also which when held against the soft palate of the patient, while doing IL, will cause burn injury. 