Draw a ray diagram of astronomical telescope and derive the formula of its magnifying power when final image is formed at the least distance of the distinct vision
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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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Write the types of telescope. For a refractive telescope, derive relation for magnifying power. Also discuss about its construction and working. - Sarthaks eConnect | Largest Online Education Community
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