Our eyes enable us to see the things in our surroundings. But, there are limitations to our vision. For example, we cannot see the things that are too far and too near. Also, we are unable to see things which are too small or too close to each other; like microorganisms. To see such small things, people use a lens or a combination of lenses. A magnifying glass (a hand lens) is a single convex lens that enlarges the image of an object. A microscope is an assembly or an arrangement of two or more lenses that enlarges the image even more. Form groups of two or three students each, and conduct the following tasks.