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How can we get same image distance for v...

How can we get same image distance for various positions of objects ?

Text Solution

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For different positions of object, the image distance remains constant only when focal length of lens changes.
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Knowledge Check

  • A concave mirror has a focal length 20cm. The distance between the two positions of the object for which the image size is double of the object size is

    A
    20cm
    B
    40cm
    C
    30cm
    D
    60cm

  • In a compound microscope the objective and eyepiece have focal length of 0.95 cm and 5cm and are kept at a distance of 20cm. If the final image is formed at least distance of distant vision, the position of object and the total magnification is

    A
    `95/94 cm, 94`
    B
    `94/95 cm, 95`
    C
    `0.94 cm, 94`
    D
    `0.95 cm, 95`

  • In a compound microscope the objective and eyepiece have focal length of 0.95cm and 5cm and are kept at a distance of 20cm. If the final image is formed at least distance of distant vision, the position of object and the total magnification is

    A
    `95/94 cm, 94`
    B
    `94/95 cm, 95`
    C
    `0.94 cm, 94`
    D
    `0.95 cm, 95`

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    In an experiment for finding the focal length of a thin convex lens using two - pin method the position of the image .upsilon. is recorded for various positrons .u. of the object. Which of the following best represents object distance u versus image distance upsilon- graph.

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