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Question

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

A
5 mm
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B
10 mm
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C
1 mm
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D
2 mm
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Solution

The correct option is C 5 mm
We use the formula for lens and magnification,
1v1u=1f

and m=vu IO

Substituting the values, the height of the image formed will be, I=5mm

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