Question

if d is far point from eye then what is the focal length​

Answer 1

Answer:

double the length if focal lenght

Answer 2

Answer:

The far point of a human eye is the farthest object distance that a typical eye is able to image onto the retina. It is at infinity for the "normal" eye. In the figure below the focal length of the accommodating normal eye is plotted versus the object distance. For the relaxed eye the focal length is 2 cm.

Explanation:

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