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16 October, 10:22

A standard biological microscope is required to have a magnification of 200X. a. When paired with a 10X eyepiece, what power objective is needed to get this magnification? b. What is the focal length of the objective?

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  1. 16 October, 13:38
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    power = 20X

    focal length = L / 20

    Explanation:

    Given data

    magnification = 200X

    eyepiece = 10X

    to find out

    power objective is needed and focal length of the objective

    solution

    we know magnification of microscope M is the product of (m1) magnifying power of object and (m2) magnifying power of eyes

    that is M = M1 * M2

    so M1 = M / M2

    put value M = 200 and M2 = 10

    M1 = 200/10 = 20

    so here power = 20X

    and

    now we calculate focal length by this formula

    M1 = (L/focal length) M2

    here L is length of tube put all value

    200 = (L/focal length) 10

    focal length = L / 20
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