Home
Class 10
PHYSICS
With a neat labelled diagram, explain th...

With a neat labelled diagram, explain the working of a refracting telescope.

Text Solution

Verified by Experts

Construction of a refracting telescope : It consists of two convex lenses called the objective lens (directed towards thew objects) and the eyepiece (directed towards the eye). The focal length and the diameter of the objective lens are respectively greater than the focal length and the diameter of the eyepiece. The objective lens is fitted at one end of a long metal tube. A metal tube of smaller diameter is fitted in this metal tube and the eyepiece is fitted at the outer end of the smaller tube. With the help of a screw it is possible to change the distance between the eyepiece and the objective lens by sliding the tube fitted with the eyepiece . The principal axes of the objective lens and the eyepiece are long the same line. A telescope is usually muonted on a stand.

Working : When the objective lens is pointed towards the distant object to be observed, the rays of light from the distant object, which are almost parallel to each other , pass through the objective lens. The objective lens collects maximum amount of light as it is large in size. It forms a real , inverted and diminished image in the focal plane of the objective lens. Now, the position of the eyepiece is adjusted such that this image falls just within the focal length length of the eyepiece and serves as the object for the eyepiece which works as a simple microscope . The final image is highly magnified, virtual , on the same side as that of the object and inverted with respect to the original object. The final image can be observed by keeping the eye close to the eyepiece. If the image formed by the objective lens lies in the focal plane of the eyepiece, the final image is formed at infinity.
Promotional Banner

Topper's Solved these Questions

  • LENSES

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise Give scientific reasons|16 Videos
  • LENSES

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise Distinguish between|6 Videos
  • LENSES

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise Answer the following questions in one sentence each :|10 Videos
  • LAWS, RULES, UNITS AND DEFINITIONS

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise Carbon Compounds|18 Videos
  • MAKING CONCEPT DIAGRAMS

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise Cell Biology and Biotechnology|2 Videos

Similar Questions

Explore conceptually related problems

With a neat labelled diagram, explain the working of a simle microscope. State uses of a simple microscope .

With a neat labelled diagram, explain how a rainbow is formed.

With a neat labelled diagram, explain the construction and working of a compound microscope.

State the principle on which the working of an electric motor is based. With a neat and well labelled diagram, explain the construction of an electric motor.

With a neat labelled diagram, explain the terms total internal reflection and critical angle.

With the help of a labelled diagram, explain the working of hydraulic brakes.

With a neat labelled diagram, explain twinkling of a star. Also explain why a planet does not twinkle.

NAVNEET PUBLICATION - MAHARASHTRA BOARD-LENSES-Answer the following questions :
  1. Where is this microscope used ?

    Text Solution

    |

  2. Suggest a way to increase the efficiency of this microscope.

    Text Solution

    |

  3. With a neat labelled diagram, explain the working of a refracting tele...

    Text Solution

    |

  4. Explain the working of an astronomical telescope using refraction of l...

    Text Solution

    |

  5. State the used of a telescope.

    Text Solution

    |

  6. Observe the figure and answer the question. Which optical instr...

    Text Solution

    |

  7. Observe the figure and answer the question. This optical instru...

    Text Solution

    |

  8. Observe the figure and answer the question. How can we get diff...

    Text Solution

    |

  9. Observe the figure and answer the question. Draw the figure aga...

    Text Solution

    |

  10. What is persistence of vision ? Give one example of persistence of vi...

    Text Solution

    |

  11. Name two devices whose working is based on the phenomenon of persisten...

    Text Solution

    |

  12. Name any two applications based on persistence of vision.

    Text Solution

    |

  13. How is the phenomenon of persistence of vision used in motion picture...

    Text Solution

    |

  14. Name the two types of ligth sensitive cells present in the retina of t...

    Text Solution

    |

  15. Why do you say that a person is colourblind ?

    Text Solution

    |

  16. Explain the perception of colour of the human eye .

    Text Solution

    |

  17. Explain in short perception of colour.

    Text Solution

    |

  18. Write a note on perception of colour.

    Text Solution

    |

  19. What is colour-blindness ?

    Text Solution

    |

  20. Why are some persons colour-blind ? What is the cause of this defect ...

    Text Solution

    |