Two lenses of focal lengths +100cm and +5cm are used to prepare an astronomical telescope. The minimum tube length will be : (final image is at ∞)
95cm
100cm
105cm
500cm
A
100cm
B
105cm
C
500cm
D
95cm
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Solution
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the length of telescope =focal length of object (−f0) +focal length of eyepiece (fe)=100+5=105cm
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