Question:

The magnifying power of a telescope is 9. When it is adjusted for parallel rays the distance between the objective and eyepiece is 20 cm. The focal length of lenses are

Options :

  • (a) 10 cm, 10 cm
  • (b) 15 cm, 5 cm
  • (c) 18 cm, 2 cm
  • (d) 11 cm, 9 cm

Answer :

(c) 18 cm, 2 cm

Answer Steps :

step 1

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