Home
Class 12
PHYSICS
A Galilean telescope is 27 cm long when ...

A Galilean telescope is 27 cm long when focussed to form an image at infinity. If the objective has a focal length of 30 cm, what is the focal length of the eyepiece?

Text Solution

Verified by Experts

The correct Answer is:
3 cm
Promotional Banner

Topper's Solved these Questions

  • OPTICAL INSTRUMENTS

    SL ARORA|Exercise Problems from Competitive Examination|3 Videos

  • MAGNETISM

    SL ARORA|Exercise Based on (i) Earth s Magnetism (ii) magnetic field of a bar magnet|60 Videos

  • RAY OPTICS

    SL ARORA|Exercise TYPE I|12 Videos

Similar Questions

Explore conceptually related problems

A compound microscope has a magnifying power of 100 when the image is formed at infinity. The objective has a focal length of 0.5 cm and the tube length is 6.5 cm. Find the fbcal length of the eyepiece.

A compound microscope has a magnifying power of 100 when the image is formed at infinity. The objective has focal length 0.5cm and the tube length is 6.5cm . Find the focal length of the eye-piece.

An astronomical telescope has an angular magnification of magnitude 5 for distant object. The separation between the objective and the eyepiece is 36 cm and the final image is formed at infinity. The focal length f_(0) of the objective and the focal length f_(0) of the eyepiece are

SL ARORA-OPTICAL INSTRUMENTS-Problems for self practice
  1. A telescope consists of an objective of focal length 50 cm and an eyep...

    Text Solution

    |

  2. An astronimical telescope is to be designed to hve a magnifying power ...

    Text Solution

    |

  3. A telescope has an objective of focal length 30 cm and an eye piece of...

    Text Solution

    |

  4. The focal length of the objective of an astronomical telescope is 1.0 ...

    Text Solution

    |

  5. The diameter of the moon is 3.5 xx 10^(3)km and its distance from the ...

    Text Solution

    |

  6. On seeing with unaided eye, the visual angle of moon at the eye is 0.6...

    Text Solution

    |

  7. A telescope objective lens has a focal length of 100 cm . When the fin...

    Text Solution

    |

  8. A refracting telescope has an objective of focal length 1 m and an eye...

    Text Solution

    |

  9. The eye-piece of an astronomical telescope has focal length of 10 cm. ...

    Text Solution

    |

  10. How would you combine two lenses of focal lengths 25 cm and 2.5 cm to ...

    Text Solution

    |

  11. A terrestrial telescope consists of three convex lenses in row whose f...

    Text Solution

    |

  12. A Galilean telescope is 27 cm long when focussed to form an image at i...

    Text Solution

    |

  13. In a Galileo's telescope the focal lengths of the objective and the ey...

    Text Solution

    |

  14. A reflecting type telescope has a concave reflector of radius of curva...

    Text Solution

    |

  15. Calculate the resolving power of a telescope whose objective has a dia...

    Text Solution

    |

  16. Find the limit of resolution of the human eye taking lambda = 6 xx 10^...

    Text Solution

    |

  17. The objective of a telescope has a diameter of 125 cm. Calculate the s...

    Text Solution

    |

  18. What is the aperture of the objective of a telescope that can be used ...

    Text Solution

    |

  19. Two point objects, separated by a distance of 6 xx 10^(-5) cm, are to ...

    Text Solution

    |

  20. Calculate the limit of resolution of a microscope if an object of nume...

    Text Solution

    |