Home
Class 12
PHYSICS
The radii of curvature of the faces of a...

The radii of curvature of the faces of a double convex lens are 20 cm and 20 cm. Its focal length is also 20 cm. What is the refractive index of the glass?

Promotional Banner

Topper's Solved these Questions

  • Reflection of Lights and Mirrors

    PUNJAB BOARD PREVIOUS YEAR PAPERS|Exercise EXERCISE|27 Videos

  • Semiconductor Devices

    PUNJAB BOARD PREVIOUS YEAR PAPERS|Exercise Exercise|84 Videos

Similar Questions

Explore conceptually related problems

The radii of curvature of the faces of a double convex lens are 20 cm and 30 cm. Its focal length is 24 cm. What is the refractive index of the glass?

The radii of curvature of the faces of a double convex lens are 10 cm and 15 cm, Its focal length is 12 cm. What is the refractive index of the glass ?

The radii of curvature of the faces of a double convex lens are 10 cm and 12 cm respectively.If the focal length of the lens is 12 cm ,find the refractive index of the material of the lens.

Find the radius of curvature of the convex surface of a plano convex lens,whose focal length is 0.3 m and the refractive index of the material of the lens is 1.5/

The radii of curvature of double convex lens are 30 cm and 60 cm and its refractive index is 1.5 .Calculate its focal length.

The radius of curvature of eithr face of a conex lens is equal to ts focal length .What is the refractive index of its material?

What is the focal length of a double convex lens for which radius of curvature of the surfaces is 40 cm and refractive index of the glass is 1.5?

PUNJAB BOARD PREVIOUS YEAR PAPERS-Refraction of Light and Lenses-EXERCISE
  1. A convex lens has 10 cm focal length in air.What is its focal length i...

    Text Solution

    |

  2. If the critical angle for total internal reflection from medium to vac...

    Text Solution

    |

  3. The radii of curvature of the faces of a double convex lens are 20 cm ...

    Text Solution

    |

  4. A convex lens has 12 cm focal length in air. What is its focal length ...

    Text Solution

    |

  5. The radii of curvature of the faces of a double convex lens are 10 cm ...

    Text Solution

    |

  6. A convex lens has 20 cm focal length in air.What is its focal length i...

    Text Solution

    |

  7. A concave lens is placed in contact with a convex lens of focal length...

    Text Solution

    |

  8. A convex lens has 10 cm focal length in air.What is its focal length i...

    Text Solution

    |

  9. A concave lens is kept in contact with convex lens of focal length 20 ...

    Text Solution

    |

  10. A convex lens is made of glass of refractive index 1.5. If radius of c...

    Text Solution

    |

  11. A needle placed 45cm from a lens forms an image on the screen placed 9...

    Text Solution

    |

  12. A lens of focal length 12 cm produces a virtual image. The size of ima...

    Text Solution

    |

  13. The image formed by the lens is erect and its length is three times th...

    Text Solution

    |

  14. A lens placed at a distance of 20 cm from an object produces a virtual...

    Text Solution

    |

  15. A needle placed 40 cm from a lens forms an image on a screen placed 80...

    Text Solution

    |

  16. What is the focal lengthof the combination of a convex lens of focal l...

    Text Solution

    |

  17. An object of size 5 cm is placed at distance of 25 cm in front of a co...

    Text Solution

    |

  18. An object of size 10 cm is placed at distance of 20 cm in front of aco...

    Text Solution

    |

  19. Two lenses of powers+15D and -5D are in contact with each other. What ...

    Text Solution

    |

  20. If the focal length of a converging lens is 50 cm. What is the power o...

    Text Solution

    |