A normal eye is not able to see objects closer than 25 cm because

Question

G1 Physics · Accepted Answer

Derived solution: Step 1: Use the thin-lens relation for the correcting lens and the eye defect: a convex lens corrects hypermetropia, a concave lens corrects myopia, and a cylindrical lens corrects astigmatism. Step 2: Substitute the values given in the question and apply the geometry/sign convention shown. Step 3: On simplification the result is the eye is not able to decrease the focal length beyond a limit.. Therefore the correct option is D.