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Q.

An astronomical telescope having focal length of objective 300 cm and of eyepiece 5 cm.  It is focused to see an object 20 km from the objective. If final image is formed at infinity, then:

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a

Length of tube is 310 cm

b

Length of tube is 295 cm

c

Angular magnification is 60

d

Angular magnification is 100

answer is C.

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Detailed Solution

L=fo+fe=305cmM=−fofe=-3005=-60 Negative sign indicates inverted image.
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