The magnifying power of a telescope is 9. When it is adjusted for parallel rays

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The magnifying power of a telescope is 9. When it is adjusted for parallel rays, the distance between the objective and the eye piece is found to be 20 cm. The focal length of lenses are
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The magnifying power of a telescope is 9. When it is adjusted for parallel rays, the distance between the objective and the eye piece is found to be 20 cm. The focal length of lenses are the distance between the objective and the eye piece is found to be 20 cm. The focal length of [...]
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