The focal length of the objective of a terrestrial telescope is 80 cm and it is adjusted for parallel rays, then its power is 20. If the focal length of erecting lens is 20 cm, then full length of the telescope will be

Options

(a) 164 cm
(b) 124 cm
(c) 100 cm
(d) 84 cm

Correct Answer:

164 cm

Explanation:

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