Home
Class 12
PHYSICS
How would you combine two lenses of foca...

How would you combine two lenses of focal lengths `25 cm and 2.5 cm` to make a telescope ? What is the magnifying power of this telescope ?

Text Solution

Verified by Experts

The correct Answer is:
Lenses should be held at a distance of `27.5 cm` from eachother, `M = - 10`
Promotional Banner

Topper's Solved these Questions

  • OPTICS

    PRADEEP|Exercise Problems for practice|4 Videos

  • OPTICS

    PRADEEP|Exercise Comprehension 1|1 Videos

  • OPTICS

    PRADEEP|Exercise Value based questions|3 Videos

  • MAGNETIC EFFECT OF CURRENT AND MAGNETISM

    PRADEEP|Exercise Competition Focus (Multiple Choice Questions)|2 Videos

Similar Questions

Explore conceptually related problems

A small telescope has an objective lens of focal length 144 cm and an eye-piece of focal length 6.0 cm . What is the magnifying power of the telescope ? What is the separation between the objective and the eye-piece ?

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 telescope has objective and eyepiece lenses of focal lengths 150 cm and 5 cm, respectively. Calculate the magnifying power of telescope when the final image is formed (a) at infinity and (b) at the least distance of clear vision.

A telescope has an objective of focal length 100 cm and an eyepiece of focal length 5 cm. What is the magnifying power of the telescope when the final image is formed at the least distance of distinct vision ?

An astronomical telescope consists of two convex lenses of focal lengths 20 cm and 4 cm. For the nomal adjustment of the telescope, what is the angular magnification produced by the telescope ?

Two thin lenses of focal lengths 20cm and 25cm are placed in contact. The effective power of the combination is

A Galilean telescope has objective and eye - piece of focal lengths 200 cm and 2cm respectively. The magnifying power of the telescope for normal vision is

A Galilean telescope has objective and eyepiece of focal lengths 200 cm and 2cm respectively. The magnifying power of the telescope for normal vision is

PRADEEP-OPTICS-Exercise
  1. A telescope consists of two lenses of focal lengths 0.3 m and 3 cm re...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  4. Two boys one 52 inches tall and the other 55 inches tall, are standing...

    Text Solution

    |

  5. The angular magnification of a telescope is 300 What should be the dia...

    Text Solution

    |

  6. The image of the moon is focussed by a converging lens of focal length...

    Text Solution

    |

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

    Text Solution

    |

  8. A compound microscope has lenses of focal length 10 mm and 30 mm. An o...

    Text Solution

    |

  9. In a compound microscope, the objective and eye piece have focal lengt...

    Text Solution

    |

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

    Text Solution

    |

  11. The lens of human eye has a diameter of 0.8 cm. How much fainter star ...

    Text Solution

    |

  12. Out of speed, frequency and wavelength, name the parameter (s) which r...

    Text Solution

    |

  13. A plane wave front falls on a convex lens. The emergent wave front is

    Text Solution

    |

  14. Out of electric field vector, vec(E) and magnetic field vector, vec(B)...

    Text Solution

    |

  15. When a wave undergoes reflection at a denser medium, what happens to i...

    Text Solution

    |

  16. In YDSE, when separation between two slits is increased, fringe width

    Text Solution

    |

  17. In Young's double slit experiment, three lights, blue, yellow and red ...

    Text Solution

    |

  18. The phase difference between two points A and B on a wavefront separat...

    Text Solution

    |

  19. what type of wavefront will emerge from (i) a point source and (ii) di...

    Text Solution

    |

  20. In Young's double slit experiment, the intensity of central maximum is...

    Text Solution

    |