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Sahay Sir > Question Answers > Cengage NEET by C.P Singh > Part 2 > Chapter 19 - Optical Instruments > In an astronomical telescope in normal adjustment a straight black line of length L is drawn on inside part of objective lens. The eye-piece forms a real image of this line. The length of this image is I . The magnification of the telescope is

In an astronomical telescope in normal adjustment a straight black line of length L is drawn on inside part of objective lens. The eye-piece forms a real image of this line. The length of this image is I . The magnification of the telescope is

its magnifying power When the length of a microscope tube increases