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Answer the following questions: (c) Ma...

Answer the following questions:
(c) Magnifying power of a simple microscope is inversely proportional to the focal length of the lens. What then stops us from using a convex lens of smaller and smaller focal length and achieving greater and greater magnifying power?

Text Solution

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The combination of lenses of small wavelengths is not easy. The more important is, if you decrease the focal length, then both defects will become stronger. Hence, in general magnifying power of simple convex lens is not possible more than 3. By system in which defect is solved this limit can be increased to 10 times or more than it.
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Knowledge Check

  • If the focal length of objective lens is increased then magnifying power of ......

    A
    microscope will increase but that of telescope decrease.
    B
    microscope and telescope both will increase
    C
    microscope and telescope both will decrease
    D
    microscope will decrease but that of telescope increase

  • The magnifying power of a simple microscope can be increased if we use eye piece of .........

    A
    higher focal length
    B
    lower focal length
    C
    larger diameter
    D
    smaller diameter

  • The magnifying power of a telescope is m. If the focal length of the eye-piece is halved, then its magnifying power is .........

    A
    `(1)/(2m)`
    B
    4m
    C
    2m
    D
    `m/2`

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    If the tube length of astronomical telescope is 96 cm and magnifying power is 15 for normal setting, then the focal length of the objective is _____ cm.

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