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[" I- "9." The focal lengths of the obje...

[" I- "9." The focal lengths of the objective and eye-lens of a microscope are "1cm" and "5cm" respectively.If "],[" magnifying power for the relaxed eye is "45," then the length of the tube is : "],[[" (A) "30cm," (B) "25cm," (C) "15cm," (D) "12cm]]

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