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Q.

In a terrestrial telescope the focal length of erecting lens is 2 cm. The length of the telescope is 96 cm. If the magnifying power of the telescope is 10, then the focal lengths of eye piece and objective are respectively

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a

8 cm, 80 cm

b

96/11 cm, 960/11 cm

c

6 cm, 90 cm

d

92/11 cm , 920/11 cm

answer is A.

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Detailed Solution

total length of a terrestrial telescope is f0+4f+fe=96 cm f=2cm f0+fe=88 cm magnification f0fe = 10

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