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The far point of a myopic person is 80 ...

The far point of a myopic person is 80 cm in front of the eye. What is the power of the lens required to enable his to see very distant objects clearly?
b) In what way does the corrective lens help the above person ? Does the lens magnify very distant objects? Explain carefully.

Text Solution

Verified by Experts

No. The concave lens, in fact, reduces the size of the object, but the agnle subtended by the image (at the far point) at the eye. The eye is able to see distant objects not because the corrective lens magnifies the object, but because it brings the object (i.e., it produces virtual image of the object) at the far point of th eeye which then can be focussed by the eye-lens on the retina.
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Knowledge Check

  • The far point of a myopic eye is 10cm from the eye.What must be the focal length of a lens for reading at normal distance (25 cm)?

    A
    `-8.35 cm`
    B
    `-16.7cm`
    C
    `-35.4cm`
    D
    `-32.7cm`

  • The far point of a shorsighted woman is 75cm from the eye. What focal length lens should the woman use in order to focus on a very distant object Also find power of the lens

    A
    `-1.33D`
    B
    `-2.33D`
    C
    `-3.4D`
    D
    `-1.9D`

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