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Question

The focal length of a normal and relaxed eye lens is about -

A
2 cm
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B
1 cm
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C
1 mm
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D
2 mm
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Solution

The correct option is A 2 cm
The focal length of a normal and relaxed eye lens is about 2 cm because a normal eye has retina, 2 cm behind the eye lens and the image of object at infinity (relaxed view) is formed at retina.

So, the focal length of a normal eye lens is equal to the distance between the eye lens and retina, i.e. about 2 cm.

Hence, option (B) is the correct answer.

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