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The focal lengths of the objective and e...

The focal lengths of the objective and eye lenses of a telescope are respectively 200 cm and 5 cm . The maximum magnifying power of the telescope will be

A

`-40`

B

`-48`

C

`-60`

D

`-100`

Text Solution

Verified by Experts

The correct Answer is:
B
(b) Magnifying power of astronomical telescope,
`m=f_(o)/(f_(e))(1+f_(e)/D)=-200/5(1+5/25)=-48`
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DC PANDEY-RAY OPTICS-Checkpoint 9.6
  1. For a normal eye, the least distance of distinct vision is

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  2. When we see an object, image formed on the retina is (i) real (ii) v...

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  3. The focal length of a normal eye lens is about

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  4. An object is placed at a distance u from a simple microscope of focal ...

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  5. Magnifying power of a simple microscope is (when final image is formed...

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  6. In a compound microscope, the intermediate image is

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  7. A compound microscope has two lenses. The magnifying power of one is 5...

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  8. The length of the compound microscope is 14 cm. The magnifying power f...

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  9. If the focal length of objective and eye lens are 1.2 cm and 3 cm resp...

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  10. The focal length of objective and eye lens of a microscope are 4 cm an...

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  11. If the telescope is reversed .i.e., seen seen from the objective side,...

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  12. The aperture of a telescope is made large, because

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  13. In an astronomical telescope, the focal length of the objective lens i...

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  14. The focal lengths of the objective and eye lenses of a telescope are r...

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  15. The number of lenses in a terrestrial telescope is

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  16. Magnifying power of a Galilean telescope is given by

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  17. In Gallilean telescope, the final image formed is

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  18. Reflecting telescope consists of

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  19. Resolving power of a microscope is given by

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  20. The resolving power of a telescope whose lens has a diameter of 1.22 m...

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