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Simple microscope is used for watch repa...

Simple microscope is used for watch repairs.

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(i) A magnifying glass works on the principle of simple microscope.
(ii) When an object is placed within the focal length of a convex lens we get a virtual, erect and magnified image on the same side of the lens.
(iii) This principle is used by the watch repairer t o see the small parts more clearly. Hence, watchmakers use a magnifying glass while repairing wristwatches.
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A simple microscope is rated 5 X for a normal relaxed eye. What Will be its magnifying power for a relaxed farsighted eye whose near point is 40 cm?

The magnifying power of a simple microscope is given by 1+D/f , where D is the least distance for clear vision. For farsighted persons, D is greater than the usual. Does it mean that the magnifying power of a simple microscope is greater for a farsighted person as compared to a normal person? Does it mean that a farsighted person can see an insect more clearly under a microscope than a normal person?

Knowledge Check

  • Simple microscope are used

    A
    To observe parts of flower
    B
    Watch repair
    C
    Observe finger prints
    D
    all the above

  • Simple microscope consists of

    A
    Short focal length of convex lens
    B
    Large focal length of concave
    C
    Large focal length of covnex
    D
    Short focal length of concave

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