Physics · Human Eye and Colorful World
A normal human eye is not able to see objects clearly if they are closer than 25 cm because:
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- 1the focal length of the eye-lens is fixed at 25 cm.
- 2the distance of the retina from the eye-lens is exactly 25 cm.
- 3the eye is not able to decrease the distance between the eye-lens and the retina beyond a limit.
- 4the ciliary muscles cannot contract further to decrease the focal length of the eye-lens beyond a certain limit.✓
Correct answer
the ciliary muscles cannot contract further to decrease the focal length of the eye-lens beyond a certain limit.
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