The focal lengths of the lenses of an astronomical telescope are 50 cm and 5 cm. The length of the telescope when the image is formed at the least distance of distinct vision is
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a
45 cm
b
55 cm
c
275/6 cm
d
325/6 cm
answer is D.
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Detailed Solution
Length of the telescope when final image is formed at least distance of distinct vision isL=fo+ue=fo+feDfe+D=50+2×255+25=3256cm