Answer
The focal length of a convex lens can be determined by focusing sunlight of distance light source at a point on a surface. The distance between lens and surface will give the focal length. This method does not work on concave lens because it diverges the light rays instead of converging.
Work Step by Step
The focal length of a convex lens can be determined by focusing sunlight of distance light source at a point on a surface. The distance between lens and surface will give the focal length. This method does not work on concave lens because it diverges the light rays instead of converging.
