Home
Class 12
PHYSICS
A small telescope has an objective lens ...

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

Text Solution

Verified by Experts

24, 150 cm
Promotional Banner

Topper's Solved these Questions

  • RAY OPTICS AND OPTICAL INSTRUMENTS

    NCERT GUJARATI|Exercise EXERCISES|40 Videos

  • NUCLEI

    NCERT GUJARATI|Exercise ADDITIONAL EXERCISES|9 Videos

  • SEMICONDUCTOR ELECTRONICS: MATERIALS, DEVICES AND SIMPLE CIRCUITS

    NCERT GUJARATI|Exercise ADDITIONAL EXERCISES|8 Videos

Similar Questions

Explore conceptually related problems

A small telescope has an objective lens of focal length 140cm and an eyepiece of focal length 5.0cm. What is the magnifying power of the telescope for viewing distant objects when (a) the telescope is in normal adjustment (i.e., when the final image is at infinity)? (b) the final image is formed at the least distance of distinct vision (25cm)?

An astronomical refractive telescope has an objective of focal length 20 m and an eyepiece of focal length 2 cm.

(a) A giant refracting telescope at an observatory has an objective lens of focal length 15m. If an eyepiece of focal length 1.0cm is used, what is the angular magnification of the telescope? (b) If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens? The diameter of the moon is 3.48 xx 10^(6)m , and the radius of lunar orbit is 3.8xx10^(8)m .

For the telescope described in Exercise 9.3 (a), what is the separation between the objective lens and the eyepiece ?

A person with a normal near point (25 cm) using a compound microscope with objective of focal length 8.0 mm and an eyepiece of focal length 2.5cm can bring an object placed at 9.0mm from the objective in sharp focus. What is the separation between the two lenses? Calculate the magnifying power of the microscope,

A compound microscope consists of an objective lens of focal length 2.0 cm and an eyepiece of focal length 6.25 cm separated by a distance of 15cm. How far from the objective should an object be placed in order to obtain the final image at (a) the least distance of distinct vision (25cm), and (b) at infinity? What is the magnifying power of the microscope in each case?

NCERT GUJARATI-RAY OPTICS AND OPTICAL INSTRUMENTS-EXERCISES
  1. A compound microscope consists of an objective lens of focal length 2....

    Text Solution

    |

  2. A person with a normal near point (25 cm) using a compound microscope ...

    Text Solution

    |

  3. A small telescope has an objective lens of focal length 144cm and an e...

    Text Solution

    |

  4. (a) A giant refracting telescope at an observatory has an objective le...

    Text Solution

    |

  5. Use the mirror equation to deduce that: (a) an object placed between...

    Text Solution

    |

  6. A small pin fixed on a table top is viewed from above from a distance ...

    Text Solution

    |

  7. (a) Figure 9.32 shows a cross-section of a 'light pipe' made of a glas...

    Text Solution

    |

  8. Answer the following questions: (a) You have learnt that plane and c...

    Text Solution

    |

  9. Answer the following questions: (b) A virtual image, we always say, ...

    Text Solution

    |

  10. Answer the following questions: (c) A diver under water, looks obliq...

    Text Solution

    |

  11. Answer the following questions: (d) Does the apparent depth of a tan...

    Text Solution

    |

  12. Answer the following questions: (e) The refractive index of diamond ...

    Text Solution

    |

  13. The image of a small electric bulb fixed on the wall of a room is to b...

    Text Solution

    |

  14. A screen is placed 90cm from an object. The image of the object on the...

    Text Solution

    |

  15. (a) Determine the 'effective focal length' of the combination of the t...

    Text Solution

    |

  16. At what angle should a ray of light be incident on the face of a prism...

    Text Solution

    |

  17. A card sheet divided into squares each of size 1 mm^(2) is being viewe...

    Text Solution

    |

  18. (a) At what distance should the lens be held from the figure in Exerci...

    Text Solution

    |

  19. What should be the distance between the object in Exercise 9.24 and th...

    Text Solution

    |

  20. Answer the following questions: (a) The angle subtended at the eye b...

    Text Solution

    |