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Q10. If the tube length of an astronomical telescope is 105 cm and magnifying power is 20 for the normal setting, calculate the focal length of the objective. 

Physics — Optics, Nature of Light and Optical Instruments — Question 10 of 155

A. 100 cm
B. 10 cm
C. 20 cm
D. 25 cm

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If the tube length of an astronomical telescope is 105 ... | Physics MCQ #10 | Examora | Examora