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An astronomical refracting telescope is being used by an observer to observe planets in normal adjustment. The focal lengths of the objective and eye piece used in the construction of the telescope are 20 ~m and 2 ~cm respectively. Consider the following statements about the telescope: (a) The distance between the objective and eye piece is 20.02 ~m (b) The magnification of the telescope is (-) 1000 (c) The image of

Options

  1. A(a), (b) and (c)
  2. B(b), (c) and (d)
  3. C(c), (d) and (a)
  4. D(a), (b) and (d)

Correct answer

D. (a), (b) and (d)

Step-by-step solution

Given, aligned & f_e=2 ~cm , and & f_o=20 ~m =2000 ~cm aligned For normal adjustment, aligned Magnification power & = -f o f e = -2000 2 & =-1000 Length of telescope & =f o+f e & =2000+2 & =2002 ~cm & =20.02 ~m aligned The image formed is inverted and magnified, and the aperture of objective is larger than eye piece of the telescope. (f_o~ & ~f_e . are focal lengths of objective & eye piece respectively.)

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