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Q.

A simple telescope, consisting of an objective of focal length 60 cm and a single eye lens of focal length 5 cm is focused on a distant object in such a way that parallel rays emerge from the eye lens. If the object subtends an angle of 20 at the objective, the angular width of the image is 

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a

100

b

500

c

240

d

(1/6)0

answer is B.

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Detailed Solution

detailed_solution_thumbnail

M=βα=f0fe

∴   β=f0feα=605×20=240

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