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Describe an activity to find the least d...

Describe an activity to find the least distance of distinct vision.

Text Solution

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1) Take a textbook and hold it with your in front of you at a certain distance.
2) Now try to read the contents on the page.
3)Slowly move the book towards your eye till it is very close to your eyes.
4)you may see that printed letters on the page of the textbook appear blurred or you feel strain in the eye.
5) Now slowly move the book backwards to a position where you can see clear printed letters without straining your eye.
6) Ask your friend to measure the distance between you eye and textbook at this position.
7) This distance is about 25 cm from your eyes. This distance is called least distance of distinct vision.
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Knowledge Check

  • The magnification produced by the objective lens of a compound microscope is 25. The focal length of eye piece is 5 cm and it forms find image at least distance of distinct vision. The magnifying power of the compound microscope is

    A
    `19`
    B
    `31`
    C
    `150`
    D
    `sqrt(150)`

  • The magnification produced by the objective lens of a compound microscope is 25. The focal length of eye piece is 5 cm and it forms find image at least distance of distinct vision. The magnifying power of the compound microscope is

    A
    19
    B
    31
    C
    150
    D
    `sqrt(150)`

  • The focal length of objective and eye lens of a microscope are 4 cm and 8 cm respectively. If the least distance of distinct vision is 24 cm and object distance is 4.5 cm from the objective lens, then the magnifying power of the microscope will be

    A
    `18`
    B
    `32`
    C
    `64`
    D
    `20`

    • Similar Questions

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    The focal length of objective and eye lens of a microscope are 4 cm and 8 cm respectively. If the least distance of distinct vision is 24 cm and object distance is 4.5 cm from the objective lens, then the magnifying power of the microscope will be

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