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Telescope

The focal len...

Question

The focal length of a normal eye-lens is about:

A

1 m m

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B

2 c m

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C

25 c m

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D

1 m

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Solution

The correct option is B $2 c m$
The focal length of a normal eye lens is about $2 c m$ because distance between eye lens and retina is approximately $2 c m$ . So, when parallel rays are coming they form image at focus and to make image at retina focal length should be about $2 c m$ .

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