to observe an object of small size requires the use of magnifying glass
magnifying_glass is not single_user_device. magnifying_glass is lens. magnifying_glass is not lens. magnifying_glass is not vision_aid. magnifying_glass is not magnifier. magnifying_glass is single_user_device. magnifying_glass is magnifier. magnification is observing. magnification is not observing. magnifying_glass is vision_aid.