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The far point of a myopic person is 150 ...

The far point of a myopic person is `150 cm` in front of the eye. Calculate the focal length and power of a lens required to enable him to see distant objects clearly.

Text Solution

Verified by Experts

The correct Answer is:
`-0.5 D`
Here, distance of far point, `x = 2 m`., power, `P = ?`
As `f = -x, f = -2 m = -200 cm`
Thus, `P = (100)/(f) = (100)/(-200) = -0.5 D`.
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Knowledge Check

  • Far point of a person is 150 cm. Calculate the focal length and power of a lens required to make him see correctly :

    A
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    B
    `-50cm, -2D`
    C
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    D
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    B
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    C
    ‐ 1.00 m
    D
    +1.00 m

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