In an astronomical telescope in normal adjustment

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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. The length of this image is l. The magnification of the telescope is?
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Aug
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. The length of this image is l. The magnification of the telescope is? a straight black line of length L is drawn on [...]
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