What device is primarily used to make small objects appear larger?

The correct answer is a microscope. A microscope is specifically designed to observe very small objects that are not visible to the naked eye, making them appear significantly larger. It achieves this through the use of lenses that magnify the image of the specimen placed under it. Microscopes are essential tools in biology and other sciences because they allow for the examination of cells, bacteria, and other tiny structures, giving scientists insight into their shapes, sizes, and structures.

While a magnifier can enlarge objects, it is generally used for slightly larger items and does not provide the same level of detail and clarity as a microscope. Telescopes, on the other hand, are used to view distant celestial objects and magnify images of the stars or planets rather than small objects. A glass slide is merely a tool used in conjunction with these devices to hold specimens for viewing under a microscope, but it does not itself magnify objects.