Home
Class 10
PHYSICS
The power of a lens is -5 D. Find its ...

The power of a lens is -5 D.
Find its focal length.

Text Solution

Verified by Experts

Given `, P= -5D`
focal length ` f= 1/P = (1)/(-5) = - 0.2 m =- 20 cm`
Promotional Banner

Topper's Solved these Questions

  • QUESTION PAPER-2018

    ICSE|Exercise SECTION-II|42 Videos

  • QUESTION PAPER 2022 TERM 1

    ICSE|Exercise MULTIPLE CHOICE QUESTIONS|40 Videos

  • QUESTION PAPER-2019

    ICSE|Exercise SECTION-II|42 Videos

Similar Questions

Explore conceptually related problems

The power of a lens is -5D. (i) Find its focal length. (ii) Name the type of lens.

The power of lens is P=1/(f) where f is focal length of the lens. The dimensions of power of lens is

The power of a lens is -5 D. Name the type of lens.

The power of lens is P=1/(f') where f is focal length of the lens. The dimensions of power of lens is

What do you mean by linear magnification produced by mirrors ? The power of a lens is +2.5 D . What kind of lens is it and what is its focal length ? Draw a ray diagram of an image when an object is placed on the principal axis of a convex lens between focus and optical centre.

A bicovex lens has radii of cuvature 20 cm each. If the refractive index of the material of the lens is 1.5, what is its focal length?

The dispersive power of the material of a lens is 0.04 and the focal length of the lens is 10cm . Find the difference in the focal length (in mm) of the lens for violet and red colour.

A thin convex lens of focal length 20 cm is kept in contact with a thin concave lens of focal length 15 cm. Find the focal length and the nature of the combination.

The length of the compound microscope is 14 cm. The magnifying power for relaxed eye is 25 . If the focal length of eye lens is 5 cm , then the object distance for objective lens will be

The focal length of a plano-concave lens is -10 cm , then its focal length when its palne surface is polished is

ICSE-QUESTION PAPER-2018 -SECTION-II
  1. The power of a lens is -5 D. Find its focal length.

    Text Solution

    |

  2. Derive a relationship between S.I. and C.G.S. unit of work.

    Text Solution

    |

  3. A force acts on a body and displaces it by a distance S in a direction...

    Text Solution

    |

  4. A half metre rod is pivoted at the centre with two weights of 20 gf an...

    Text Solution

    |

  5. A half metre rod is pivoted at the centre with two weights of 20 gf an...

    Text Solution

    |

  6. A half metre rod is pivoted at the centre with two weights of 20 gf an...

    Text Solution

    |

  7. Draw a diagram to show a block and tackle pulley system having a veloc...

    Text Solution

    |

  8. The pulley system drawn lifts a load of 150 N when an effort of 60 N i...

    Text Solution

    |

  9. Is the above pulley system an ideal machine or not?

    Text Solution

    |

  10. A ray of light XY passes through a right angled isosceles prism as sho...

    Text Solution

    |

  11. A ray of light XY passes through a right angled isosceles prism as sho...

    Text Solution

    |

  12. A ray of light XY passes through a right angled isosceles prism as sho...

    Text Solution

    |

  13. An object AB is placed between O and F1 on the principal axis of a con...

    Text Solution

    |

  14. An object is placed at a distance of 12 cm from a convex lens of focal...

    Text Solution

    |

  15. An object is placed at a distance of 12 cm from a convex lens of focal...

    Text Solution

    |

  16. Draw a diagram of a right angled isoscels prism which is used to make ...

    Text Solution

    |

  17. The diagram below shows a wire stretched over a sonometer. Stems of tw...

    Text Solution

    |

  18. The diagram above shows a wire stretched over a sonometer. Stems of tw...

    Text Solution

    |

  19. The diagram above shows a wire stretched over a sonometer. Stems of tw...

    Text Solution

    |

  20. A person is standing at the sea shore. An observer on the ship which i...

    Text Solution

    |

  21. A person is standing at the sea shore. An observer on the ship which i...

    Text Solution

    |