A telescope has an objective lens of focal length 200 cm and an eye piece with focal length 2 cm. It is used to see a 5m tall building at a distance of 2 km. The height of the image of the building formed by the objective lens is

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5 mm

10 mm

1 mm

2 mm

answer is A.

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Detailed Solution

1f0=1v0+1u0 but m=v0u0=IO

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