The thin piece of glass used in preparing a slide is called a coverslip. It is typically square or rectangular in shape and is used to cover the specimen on a microscope slide. To find this answer, you can start by understanding the context of the question. Since it mentions the preparation of a slide, it is likely asking about a component used in microscopy. To confirm the answer, you can search online using keywords such as "thin glass piece for microscope slide," and the term "coverslip" will be provided as the correct term.
