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Q.

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

45cm

b

55cm

c

2756cm

d

3256cm

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+5×255+25=3256cm
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