Home
Class 10
PHYSICS
Calculate the focal length of a correcti...

Calculate the focal length of a corrective lens having power`+2.5D.

Text Solution

Verified by Experts

The correct Answer is:
40 cm
Promotional Banner

Topper's Solved these Questions

  • LENSES

    NAVNEET PUBLICATION|Exercise EXERCISE|280 Videos

  • HEAT

    NAVNEET PUBLICATION|Exercise EXERCISE|135 Videos

  • REFRACTION OF LIGHT

    NAVNEET PUBLICATION|Exercise EXERCISE|141 Videos

Similar Questions

Explore conceptually related problems

The focal length of a concave lens with power -4D is______

The focal length of a lens depends on

The focal length of a convex lens is 20 cm.What is the power?

If the focal length of the objective lens is increased then

An object is kept at 10 cm in front of a convex lens . Its image is formed on the screen at 15 cm from the lens. Calculate (i) the focal length of the lens (ii) the magnification produced by the lens.

State whether the following statements are true or false : ( If a statement is false , correct it and rewrite it.) : The focal length of a concave lens is negative .

Find the focal length of a convex lens which produces a virtual image at 10 cm from the lens when an object is placed at 5 cm from the lens .

NAVNEET PUBLICATION-LENSES-EXERCISE
  1. Solve the following examples/ numerical problems: < br > What is the p...

    Text Solution

    |

  2. Solve the following examples/ numerical problems: The power of a con...

    Text Solution

    |

  3. Calculate the focal length of a corrective lens having power+2.5D.

    Text Solution

    |

  4. Solve the following examples/ numerical problems: Calculate the foca...

    Text Solution

    |

  5. Three lenses having power 2, 2.5 and 1.7 D are kept touching in a row....

    Text Solution

    |

  6. Solve the following examples/ numerical problems: Two convex lenses ...

    Text Solution

    |

  7. Solve the following examples/ numerical problems: Two convex lenses ...

    Text Solution

    |

  8. Solve the following examples/ numerical problems: < br > If a convex l...

    Text Solution

    |

  9. Find the focal length of a convex lens which produces a real image at ...

    Text Solution

    |

  10. Find the focal length of a convex lens which produces a virtual image ...

    Text Solution

    |

  11. A real image is obtained at 30 cm from a convex lens of focal length 7...

    Text Solution

    |

  12. An object is kept at 20 cm in front of a convex lens its real image is...

    Text Solution

    |

  13. An object is kept at 10 cm in front of a convex lens . Its image is f...

    Text Solution

    |

  14. An object is kept at 60 cm in front of a convex lens of focal length 1...

    Text Solution

    |

  15. An object of height 2 cm is kept at 30 cm from a convex lens . Its rea...

    Text Solution

    |

  16. If the power of a lens is 4 dioptres , find its focal length.

    Text Solution

    |

  17. Find the power of a convex lens of focal length 40 cm.

    Text Solution

    |

  18. Find the power of a convex lens of focal length 12.5 cm.

    Text Solution

    |

  19. If for a lens , f= -20 cm, what is the power of the lens ?

    Text Solution

    |

  20. An object of height 4 cm is kept in front of a concave lens of focal l...

    Text Solution

    |