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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

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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.

What is called by, the ability of eye lens to change its focal lengths

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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    The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to

    Read the following and answer the question : Srilatha and Sunitha are friends. Srilatha can see the far objects clearly from the point of 90 cm away from the eyes. Sunitha can see the closer objects upto the distance of 200 cm clearly. Who is suffering from hypermetropia ?

    Read the following and answer the question : Srilatha and Sunitha are friends. Srilatha can see the far objects clearly from the point of 90 cm away from the eyes. Sunitha can see the closer objects upto the distance of 200 cm clearly. Who is suffering from myopia ?

    Kavya can see distant objects clearly but cannot see objects at near distance. With what eye defect is she suffering ? Draw the diagrams showing the defected eye and its correction ?

    The eye of a farsighted person has a near point of 90cm. Objects nearer than 90cm cannot be seen clearly. A converging lens is used to correct the vision of a book placed 25cm from the eye. Find the focal length of this lens.

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