Question

Two different types of lenses are placed on a sheet of newspaper. How will you identify them without touching?

Answer 1

1. When we place two different types of lenses on a newspaper, we can identify the lenses by looking at the size of the image produced by the lenses.
2. If the image produced by a lens is larger than the actual size of the text of the newspaper then it is a convex lens, as convex lenses produced a magnified image.
3. And if the image produced by a lens is smaller than the actual size of the text of the newspaper then it is a concave lens, as a concave lens produces a diminished image.