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The magnifying power of a telescope is 9 in normal adjustment. When it is adjusted for parallel rays, the distance between the objective lens and the eyepiece is 20 cm. The focal length of the lenses are - |
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Answer» The magnifying power of a telescope is 9 in normal adjustment. When it is adjusted for parallel rays, the distance between the objective lens and the eyepiece is 20 cm. The focal length of the lenses are - |
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