Home
Class 12
PHYSICS
A convex lens of refractive index 1.5 ha...

A convex lens of refractive index 1.5 has a focal length of 18 cm in air.Calculate the change in focal length,when it is immersed in water of refractive index `4//3`.

A

1D

B

`-1D`

C

`25D`

D

`-25 D`.

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • UNIT TEST -06

    MODERN PUBLICATION|Exercise EXERCISE|461 Videos

  • TEXUAL QUESTIONS

    MODERN PUBLICATION|Exercise EXERCISE|195 Videos

  • UNIT TEST -07

    MODERN PUBLICATION|Exercise EXERCISE|154 Videos

Similar Questions

Explore conceptually related problems

A converging lens has a focal length of 20 cm in air. It is made of a material of refractive index 1.6. If it is immersed in a liquid of refractive index 1.3, what will be the new focal length? How does the nature of the lens change. If this lens is immersed is a liquid of refractive index 1.8 ?

A double convex lens has 10 cm and 15 cm as its two radii of curvature.The image of an object,placed 30 cm from the lens,is formed at 20 cm from the lens on the other side.Find the refractive index of the material of the lens.Whgat will be the focal length ?What will be the focal length of the lens,if it is immersed in water of refractive index 1.33?

What happens to be focal length of convex lens when it is immersed in water?

A convex lens of refractive index 1.5 is immersed in a liquid of refractive index: 1.6 What will happen to the focal length and nature of lens ?

The radii of curvature of a convex lens are 20 cm and 30 cm nd the refractive index of its material is 1.5 .How its nature nd focal length will change ,when it is immersed in a liquid of refractive index = 1.6?

Focal length of a convex lens of refractive index 1.5 is 2 cm.Focal length of lens,when immersed in a liquid of refractive index of 1.25 will be

MODERN PUBLICATION-UNIT TEST -06-EXERCISE
  1. A plano convex lens of refractive index 1.5 and radius of curvature 30...

    Text Solution

    |

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

    Text Solution

    |

  3. A convex lens of refractive index 1.5 has a focal length of 18 cm in a...

    Text Solution

    |

  4. The refractive indices of the crown glass for blue and red light are 1...

    Text Solution

    |

  5. The total magnification produced by a compound microscope is 20,while ...

    Text Solution

    |

  6. Explain with reason,how the resolving power of an astronomical telesco...

    Text Solution

    |

  7. An initially parallel cylindical beam travels in a medium of refractiv...

    Text Solution

    |

  8. An initially parallel cylindical beam travels in a medium of refractiv...

    Text Solution

    |

  9. An initially parallel cylindical beam travels in a medium of refractiv...

    Text Solution

    |

  10. What is the main condition to produce interference of light?

    Text Solution

    |

  11. In Young's double slit experiment what is the shape of interference fr...

    Text Solution

    |

  12. In a Young's double slit experiment,the intensity at a point,where the...

    Text Solution

    |

  13. A beam of light consisting of two wavelengths, 650 nm and 520 nm, is u...

    Text Solution

    |

  14. Define coherent sources of light, fringe width and interference of lig...

    Text Solution

    |

  15. The question has a paragraph followed by two statements, Statement 1 a...

    Text Solution

    |

  16. If I0 is the intensity of the principal maximum in the singel slit dif...

    Text Solution

    |

  17. Two point white dots are 1 mm apart on a black paper.They are viewed y...

    Text Solution

    |

  18. Wavelength of light used in an opticla instrument are lambda1=4,000 ov...

    Text Solution

    |

  19. This angle of incidence at which relfeted ligth is totally polarised f...

    Text Solution

    |

  20. When an unpolarised light intensity I0 is incident on a polarising she...

    Text Solution

    |