Home
Class 10
PHYSICS
My grandfather uses a bifocal lens in hi...

My grandfather uses a bifocal lens in his spectacles. Explain why.

Text Solution

Verified by Experts

In old age, people usually suffer from both myopia and hypermetropia . Therefore, they need spectacles having bifocal lenses.
The upper part of a bifocal lens is a concave lens to correct myopia. The lower part of a bifocal lens is a convex lens to correct hypermetropia .
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

What is a bifocal lens ?

When are bifocal lenses used in spectacles?

Why do some people use bifocal lenses ?

(a) The far point of a myopic person is 80 cm . In front of the eye. What is the power of the lens required to enable him to see very distant objects clearly ? (b) In what way does the corrective lens help the person above ? Does the lens magnify very distant objects ? Explain carefully. ( c) The person above prefers to remove his spectacles while reading a book. Explain why ?

Aniket from Std. X uses spectacles. The power of the lenses in his spectacles is -0.5 D. Find the focal length of the lenses used in his spectacles.

A man can see clearly up to 3 metres. Prescribes a lens for his spectacles so that he can see clearly up to 12 metres

NAVNEET PUBLICATION - MAHARASHTRA BOARD-LENSES-Answer the following questions :
  1. Surabhi from Std. X uses spectacles. The power of the lenses in her sp...

    Text Solution

    |

  2. Surabhi from Std. X uses spectacles. The power of the lenses in her sp...

    Text Solution

    |

  3. My grandfather uses a bifocal lens in his spectacles. Explain why.

    Text Solution

    |

  4. State used of a concave lens.

    Text Solution

    |

  5. State used of a convex lens.

    Text Solution

    |

  6. What is meant by the apparent size of an object ? With a neat and labe...

    Text Solution

    |

  7. With a neat labelled diagram, explain the working of a simle microscop...

    Text Solution

    |

  8. What does a simple microscope consist of ? What is the order of magni...

    Text Solution

    |

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

    Text Solution

    |

  10. State two uses of a compound microscope .

    Text Solution

    |

  11. What will happen if in a compound microscope , the objective lens is l...

    Text Solution

    |

  12. In which type of microscope do you find the lens arrangement as shown ...

    Text Solution

    |

  13. Write in brief , the working of this microscope.

    Text Solution

    |

  14. Where is this microscope used ?

    Text Solution

    |

  15. Which type of microscope has the arrangement of lenses shown in the fo...

    Text Solution

    |

  16. Label the figure correctly .

    Text Solution

    |

  17. Write the working of this microscope .

    Text Solution

    |

  18. Where is this microscope used ?

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |