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Q.

An astronomical telescope has objective and eyepiece of focal length 40 cm and 4 cm respectively. To view an object 200 cm away from the objective, at what distance the lenses must be separated (in cm)?

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a

54

b

78

c

68

d

10

answer is A.

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Detailed Solution

1v1200=140

 v=50 cm d=50+4=54cm

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An astronomical telescope has objective and eyepiece of focal length 40 cm and 4 cm respectively. To view an object 200 cm away from the objective, at what distance the lenses must be separated (in cm)?