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A telescope has an objective lens of foc...

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

A

5 cm

B

10 cm

C

1 cm

D

2 cm

Text Solution

Verified by Experts

The correct Answer is:
A
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A small telescope has an objective lens of focal length 150 cm and and eye piece of focal length 5 cm . If his telescope is used to view a 100 m high tower 3 km away, find the height of the final image when it is formed 25 cm away from the eye piece.

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Knowledge Check

  • 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 ofthe building formed by the obj ective lens is

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

  • A small telescope has an objective lens of focal length 140 cm and eye piece of focal length 5.0 cm. The telescope is used to view a 100 m tall tower 3 km away. The height of the image ' of the tower formed by objective lens is

    A
    `14/3`cm
    B
    `11/3` cm
    C
    `17/3 cm`
    D
    `8/3` cm

  • A telescope has an objective of focal length 100 cm and an eye-piece of focal length 5 cm. What is the magnifying power of the telescope when it is in normal adjustment?

    A
    0.2
    B
    2
    C
    20
    D
    200

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