Q.

A telescope has an objective lens of focal length 200 cm and an eye piece with focal length 2 cm. If this telescope is used to see a 50 meter tall building at a distance of 2 km, what is the height of the image of the building formed by the objective lens

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a

5 cm

b

10 cm

c

1 cm

d

2 cm

answer is A.

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Detailed Solution

Magnification of objective lens m=IO=v0u0=f0u0 ⇒I50=200×10−22×103⇒I=5×10−2m=5cm
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A telescope has an objective lens of focal length 200 cm and an eye piece with focal length 2 cm. If this telescope is used to see a 50 meter tall building at a distance of 2 km, what is the height of the image of the building formed by the objective lens