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10 May, 18:15

The objective lens of a refracting telescope has a focal length of 60 cm and the eyepiece a focal length of 8.0 cm. what is the angular magnification of the telescope?

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  1. 10 May, 18:29
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    The solution would be like this for this specific problem:

    Given:

    Focal length of the objective lens (fo) = 60 cm

    Focal length of the eyepiece (fe) = 8.0 cm

    Find:

    angular magnification of the telescope = ?

    So, the formula for angular magnification is:

    a = f0 / fe

    Where fo = objective lens, and fe = eye lens

    So, we divide the total length of the objective lens by the total length of the eyepiece:

    a = fo / fe

    a = 60 cm / 8.0 cm

    a = 7.5 cm

    Therefore, the angular magnification of the telescope is 7.5 cm.
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