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The focal length of an objective of a telescope is 3 metre and diameter 15 cm. Assuming for a normal eye, the diameter of the pupil is 3 mm for its complete use, the focal length of eye piece must be

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a

6 cm

b

6.3 cm

c

20 cm

d

60 cm

answer is A.

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Detailed Solution

Full use of resolving power means whole aperture of objective in use. And for relaxed vision.fofe=Dd⇒300fe=150.3⇒fe=6 cm

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