The focal length of the lens of a normal human eye is about

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Q: 37 (CDS-II/2015)
The focal length of the lens of a normal human eye is about

question_subject: 

Science

question_exam: 

CDS-II

stats: 

0,3,26,22,1,3,3

keywords: 

{'focal length': [1, 0, 5, 7], 'normal human eye': [0, 0, 0, 1], 'lens': [0, 0, 0, 1], 'cm': [2, 0, 7, 20]}

The focal length of a lens refers to the distance between the lens and the point where light rays converge or diverge. In the case of a normal human eye, the focal length of the lens is approximately 2-5 cm.

Option 1: 25 cm is not the correct answer because it is too long for the focal length of a normal human eye.

Option 2: 1 m is also not the correct answer because it is significantly longer than the expected focal length of the human eye.

Option 3: 2-5 mm is not the correct answer because it is too short for the focal length of a normal human eye.

Therefore, option 4, which states that the focal length of the lens of a normal human eye is about 2-5 cm, is the correct answer to the question. It is in the expected range for the focal length of the human eye lens.