A Galilean telescope measures 9 cm from the objective to the eye-piece. The focal length of the objective is 15 cm. Its magnifying power is A. $2.5$ B. $\\dfrac{2}{5}$ C. $\\dfrac{5}{3}$ D. $\\dfrac{3}{5}$
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when an astronomical telescope is in normal adjustment,the magnification produced by it is M.If this is now turned around with the eyepiece facing a dis†an t object and the eye placed close
In an astronomical telescope in normal adjustment a straight black line of length L is drawn on inside part of the objective lens. The eyepiece forms a real image of this line.
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