Question In many department stores, large plane mirrors have been placed high on walls or on projections from ceilings. These may be one-way mirrors that are designed to allow one-way surveillance of the store. From one side, this surface looks like a mirror, but from the other side, the activities of the shoppers can be observed. Suggest how this type of mirror works. Answer I think: All light received by the observer is reflected by the glass. No light comes from inside. PLEASE HELP ME WITH THIS QUESTION IF I AM WRONG.