alleryThe least distance of distinct vision for a normal eye is approximately:
A25 cm from eye
B10 cm from eye
C50 cm from eye
D75 cm from eye
Answer & Solution
Correct answer: A. 25 cm from eye
1. The least distance at which a normal eye can read comfortably is ~25 cm.
2. Closer than that, the ciliary muscles strain and the image blurs.
3. This 25 cm value is used in magnifier and microscope formulas.
_Source: syllabus Science Ch 10 §10.1.1 Range of Vision_
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