Home
Class 12
PHYSICS
The length of the tube of an astronomica...

The length of the tube of an astronomical telescope is 80 cm and the magnifying power of the instrument is 19 . Calculate the focal lengths of the objective and the eyepiece.

Text Solution

Verified by Experts

The correct Answer is:
`f_o=76 cm ,f_e=4 cm`
Promotional Banner

Topper's Solved these Questions

  • OPTICAL INSTRUMENTS

    CHHAYA PUBLICATION|Exercise Problem Set -II|6 Videos

  • OPTICAL INSTRUMENTS

    CHHAYA PUBLICATION|Exercise Problem Set -II ( Hots Numerical Problems )|8 Videos

  • OPTICAL INSTRUMENTS

    CHHAYA PUBLICATION|Exercise Exercise (short Answer Type Questions-I)|1 Videos

  • Magnetic Properties of Materials

    CHHAYA PUBLICATION|Exercise CBSE SCANNER|11 Videos

  • QUANTUM THEORY

    CHHAYA PUBLICATION|Exercise CBSE Scanner|29 Videos

Similar Questions

Explore conceptually related problems

The focal length of objective lens of astronomical telescope is

The lengths of the tube of an astronomical telescope is 44 cm and its angular magnification is 10 . What is the focal length of its objective ?

If the focal length of objective lens is increased then magnifying power of the

In an astronomical telescope, focal length of the objective is made

The focal lengths of the objective and the eyepiece of an astronomical telescope are 140 cm and 5 cm respectively. The magnifying power of the telescope for viewing objects when the final image is formed at the least distance of distinct vision (25 cm ) will be

Is the length of the instrument to be changed if the focal length of the objective of an astronomical telescope is increased ?

In an astronomical telescope , focal length of the objective is made

If the focal length of the eye piece of a telescope is doubled, its magnifying power (m ) will be

CHHAYA PUBLICATION-OPTICAL INSTRUMENTS-Problem Set -I
  1. A shortsighted man can read the writings of a book keeping it at a dis...

    Text Solution

    |

  2. A man uses spectacles of a concave lens for his defective eye and can...

    Text Solution

    |

  3. By using the spectacles of a concave lens of power -5 m^(-1) a man can...

    Text Solution

    |

  4. A boy can see the objects distinctly only in between 15 cm and 200 cm ...

    Text Solution

    |

  5. The near point of a man is at a distance of 200 cm from his eyes. Wha...

    Text Solution

    |

  6. The far point of a myopic (short-sighted ) person is 80 cm in front of...

    Text Solution

    |

  7. The near point of a hypermetropic (long -sighted ) person is 75 cm fro...

    Text Solution

    |

  8. The least distance of distinct vision of a man is 1m . What type of ey...

    Text Solution

    |

  9. The focal lengths fo the lens of a simple microscope is 5 cm . If the ...

    Text Solution

    |

  10. Two lenses having power +15 m ^(-1) and +5 m^(-1) are placed in conta...

    Text Solution

    |

  11. Two convex lenses of focal length 1.5 cm and 9 cm are arranged to for...

    Text Solution

    |

  12. The focal lengths of the objective and the eyepiece of a compound micr...

    Text Solution

    |

  13. The focal lenghts of the objective and the eyepiece of a compound micr...

    Text Solution

    |

  14. The focal of the objective and the eyepiece of a compound microscope ...

    Text Solution

    |

  15. The length of the tube of an astronomical telescope is 80 cm and the ...

    Text Solution

    |

  16. The magnifying power of an astronomical telescope for normal vision is...

    Text Solution

    |