At what magnification \( \Gamma \) of a telescope with a diameter of the objective \( D=6.0 \mat...

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At what magnification \( \Gamma \) of a telescope with a diameter of the objective \( D=6.0 \mathrm{~cm} \) is the illuminance of the image of an object on the retina not less than without the telescope? The pupil diameter is assumed to be equal to \( d_{0}=3.0 \mathrm{~mm} \). The losses of light in the telescope are negligible.
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