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Near point : 25 cm :: far point :...

Near point : 25 cm :: far point : ____

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infinity Near point of nonnal human eye is 25 cm. Similarly, far point of nonnal human eye is infinity.
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Knowledge Check

  • A presbyopic patient has near point as 30 cm and far point as 40 cm . The dioptric power for the corrective lens for seeing distant objects is

    A
    40 D
    B
    4 D
    C
    `- 2.5 D`
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    A
    `-2D` and `-0.33D`
    B
    `2D` and `-0.33D`
    C
    `-2D` and `3D`
    D
    `2D` and `-3D`

  • A person's near point is 50 cm and his far point is 3 m . Power of the lenses he requires for (i) reading and (ii) for seeing distant stars are

    A
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    B
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    C
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    D
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    If the ratio of magnifications produced by a simple microscope in near point adjustment and far point adjustment is 6/5 then the focal length of the lens is (Take D=25cm )

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