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What is persistance of vision ?...

What is persistance of vision ?

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The time for which the sensation of vision (of an object) continues in the eye is called persistance of vision. It is about `1//16^(th)` part of a second.
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Knowledge Check

  • A microscope consists of an objective of focal length 1.9 cm and eyepiece of focal length 5 cm. The two lenses are kept at a distance of 10.5 cm. If the image is to be formed at the least distance of distinct vision, the distance at which the object is to be placed before the objective is (least distance of distinct vision is 25 cm)

    A
    6.2 cm
    B
    2. 7cm
    C
    21.0 cm
    D
    4.17 cm

  • The least distance of distinct vision is 25 cm. The magnifying power of a simple microscope of focal length 5 cm is

    A
    )`1/5`
    B
    5
    C
    `1/6`
    D
    6

  • The focal length of objective and eyelens of a astronomical telescope are respectively 20 cm and 5 cm. Final image is formed at least distance of distinct vision. The magnifying power will be

    A
    `-4.8`
    B
    `-4.0`
    C
    4.8
    D
    `4.0`

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    The least distance of distinct vision for a young adult with normal vision is about

    Least distance of distinct vision of a person is observer as 35 cm. What lens is useful for him to see his surrondings clearly? Why ?

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