Question

1. Which, if any, of these people are nearsighted (myopic)?

List the first letter of all correct answers in alphabetical order. For example, if Avishka and Edouard are the only nearsighted ones, enter AE.

2.Which, if any, of these people require bifocals to correct their vision?

3.Which, if any, of these people's vision can be corrected using only converging lenses?

Please show work and units.

The near point (the smallest distance at which an object can be seen clearly) and the far point (the largest distance at which an object can be seen clearly) are measured for six different people.

Answer 1

1. Nearsighted person can view the near object, but unable to see the farer objects. The fully relaxed eye can focus only out to a finite distance. Thus, the far point should be some finite value instead of infinite.

   Therefore, the nearsighted persons are B(Berenice), C(Chadwick), & E(Edouard).

2. Bifocal lenses are used to a person, which are suffering from both myopic and hypermetropia. The person suffered with presbyopia uses bifocal lens. This lens consists of both converging lens and diverging lens.

   Therefore, the persons wear bifocal lenses are B(Berenice) and E(Edouard).

3. A person suffers from farsighted ness, which means cannot focus on objects closer than near point. This defect is corrected by converging lens.

   Therefore, the farsighted persons are A (Avishka) and F (Francesca).