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The loss of ability of an eye to focus n...

The loss of ability of an eye to focus near and far objects, with the advancing age is called

A

myopia

B

presbyopia

C

astigmatism

D

hypermetropia

Text Solution

Verified by Experts

The correct Answer is:
B
We know that the loss of ability of an eye to focus near and far objects with the advancing age, is called presbyopia . It is corrected by a bifocal lens .
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A philatelist examines the printing details on a stamp using a convex lens of focal length 10.0 cm as a simple magnifier. The lens is held close to the eye and the lens to object distance is adjusted so that the virtual image is formed at the normal near point (25 cm). Calculate magnification.

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Knowledge Check

  • A defect of vision, in which lines in one plane of an object appear in facus while those in another plane are out of focus is called

    A
    myopia
    B
    distortion
    C
    astigmatism
    D
    hypermetropia

  • 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`

  • Consider the following statements : a) For a normal eye, the far point isat infinity. b) Focal length of eye lens is fixed. c) The change in focal length of eye lens to focus image at varying distance is done by the action of pupil . Which of the these statement (s) / are correct ?

    A
    only (b)
    B
    only (a)
    C
    (a) and (b)
    D
    (b) and (c)

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