Final answer:
A plus lens mounted in front of the spectacle plane, separated by some distance, is used to correct the vision of a farsighted person.
Step-by-step explanation:
When a plus lens is mounted in front of the spectacle plane, it is separated by some distance from the spectacle plane.
This is done to correct the vision of a farsighted person.For example, if a farsighted person has a near point of 1.00 m, but wants to see an object that is 25.0 cm away, a plus lens with a specific power is needed.
The power of the lens can be calculated using the lens equation, which relates the power of the lens to the object distance, image distance, and focal length of the lens.
It is important to note that wearing glasses does not change the eye, but simply creates an image of the object at a distance where the farsighted person can see it clearly.