Applications: III. Magnifiers
The size of the images seen by our eyes depends on the objects actual size and on its distance away
What really matters is the angular size of the object
The angular size can be increased by bringing closer to the eye: if too close we cannot focus on it
We can get both an increased angular size and sharp image by using converging lens.
Magnifying glass and microscope (magnification is the product of the magnification of the objective and eyepiece lens)