Chapter 13, Problem 35R

To determine

To explain: The reason for using glasses with bifocal lens.

Explanation of Solution

Introduction:

In bifocal eyeglasses, there are two segments with different refractive indices. Generally, the lower segment of bifocal is used for near vision while the upper segments is used for distant or ordinary vision.

Bifocal eyeglasses are two fine glasses with one optical power which is used by a presbyopia person who also required the correction of hyperopia, myopia and astigmatism.

Conclusion:

Hence, the person who have hyperopia they used bifocal lens.