Question

Calculate the maximum power of accommodation of a person having normal vision.

Answer 1

Answer:

The answer is 4D.

Explanation:

The distance a normal eye can see is up to 25 cm. Therefore eye can focus an image at a distance of 25 cm so f = 25 cm.

We know that the formula of power for lenses is

P = 1/ f

Here f= 25 cm

Power is measured in diopters. Thus 1D = 100 cm

P = 100 / 25  

P = 4D

Thus the power of accommodation of a person having normal vision is 4D.

Answer 2

Answer: 4D

Explanation: