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Sahay Sir > Question Answers > Cengage NEET by C.P Singh > Part 2 > Chapter 19 - Optical Instruments > The diameter of the moon is 3.5×10^3 km and its distance from the earth is 3.8×10^5 km. It is seen by a telescope having the focal length of the objective and the eye-piece as 4m and 10cm respectively. The diameter of the image of the moon will be approximately

The diameter of the moon is 3.5×10^3 km and its distance from the earth is 3.8×10^5 km. It is seen by a telescope having the focal length of the objective and the eye-piece as 4m and 10cm respectively. The diameter of the image of the moon will be approximately

its magnifying power When the length of a microscope tube increases