An astronomical refractive telescope has an objective of focal length 20 m and an eyepiece of focal length 2 cm. a. The length of the telescope tube is 20.02 m. b. The magnification is 1000. c. The image formed is inverted. d. An objective of a larger aperture will increase the brightness and reduce chromatic aberration of the image.

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a, b and c Explanation: The length of the telescope L = f0 + fe = 20 + 00.02 = 20.02 m And `m = f_0/f_e = (20 m)/(0.02 m) = $\frac{2000}{2}$` = 1000 The final image formed in the telescope (Refracting) is inverted, virtual and smaller than an object.

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