Question

A person struggles to read by holding a book at arm's length, a distance of 55 cm away. What power of reading glasses should be prescribed for her, assuming they will be placed 2.1 cmfrom the eye and she wants to read at the "normal" near point of 25 cm ?

Answer 1

To correct the person's difficulty reading, a pair of reading glasses with a power of 1.82 D should be prescribed.

Step-by-step explanation:

To determine the power of reading glasses needed, we can use the formula:

Power of Lens = 1 / Distance (in meters)

First, we convert the distance of 55 cm to meters by dividing it by 100: 55 cm = 0.55 m.

The power of the lens needed would be: Power = 1 / 0.55 = 1.82 diopters (D).

Therefore, a pair of reading glasses with a power of 1.82 D should be prescribed.