Question

calculate the maximum power of accommodation of a normal human eye (pls explain why 25 cm is not taken as negative)​

Answer 1

Answer:

power of accommodation of human is +25cm as the human eye lens is a convex mirror whose focal length is taken as positive. (P=1\f)

Explanation:

as per the new cartesian sign convention the distance taken on right is always positive.

Answer 2

Answer:

Power of eye is 25cm

Explanation:

This is because focal length of eye cannot adjust nearby objects with in 25cm and far point is infinitive