Home
Class 11
PHYSICS
Convex lens is made of glass of refracti...

Convex lens is made of glass of refractive index `1.5` If the radius of curvature of each of the two surfaces is `20 cm` find the ratio of the powers of the lens, when placed in air to its power, when immersed in a liquid of refractive index `1.25`.

A

`2:5`

B

`5:2`

C

`3:2`

D

`2:3`

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • RAY OPTICS

    TARGET PUBLICATION|Exercise EVALUATION TEST|16 Videos

  • RAY OPTICS

    TARGET PUBLICATION|Exercise CRITICALTHINKING|38 Videos

  • OPTICS

    TARGET PUBLICATION|Exercise EXERCISE|447 Videos

  • REFRACTION OF LIGHT

    TARGET PUBLICATION|Exercise EVALUATION TEST|15 Videos

Similar Questions

Explore conceptually related problems

A plano-convex lens is made of material having refractive index 1.5. The radius of curvature of curved surface is 60 cm. The focal length of the lens is ______ cm.

The power of a biconvex lens is 10 dioptre and the radius of curvature of each surface is 10 cm. Then the refractive index of the material of the lens is,

Two plano-concave lenses (1 and 2) of glass of refractive index 1.5 have radii of curvature 20 cm and 10 cm. They are placed in contact with their curved surface towards each other and the space between them is filled with liquid of refractive index 4/3. Then the combination is

A double convex thin lens made of glass (refractive index mu = 1.5 ) has both radii of curvature of magnitude 20 cm . Incident light rays parallel to the axis of the lens will converge at a distance L such that

The convex surface of a thin concavo-convex lens of glass of refractive index 1.5 has radius of curvature 10 cm. The concave surface has a radius of curvature 30 cm. The convex side is silvered and placed on a horizontal surface. Then where should a pin be placed on the optic axis such that its image is formed at the same place?

Two identical thin planoconvex glass lenses (refractive index 1.5) each having radius of curvature of 20cm are placed with their convex surfaces in contact at the centre. The intervening space is filled with oil of refractive index 1.7 . The focal length of the combination is

A double convex lens has focal length 25 cm. The radius of curvature of one of the surfaces is double of the other. Find the radii if the refractive index of the material of the lens is 1.5.

What is the focal length of double convex lens for which radius of curvature of either of the surfaces is 30 cm? [ ""_(a) mu_(g)=1.5]

A concave lens of glass, refractive index 1.5 has both surfaces of same radius of curvature R. On immersion in a medium of refractive index 1.75, it will behave as a

A convex lens (with material of refractive index of 3/2) has two surfaces of equal radii of curvature R. The magnitude of its focal length is

TARGET PUBLICATION-RAY OPTICS-COMPETITIVE THINKING
  1. An astronomical telesope has objective and eyepiece of focal lengths 4...

    Text Solution

    |

  2. A telescope using an eye piece of focal length 3 cm has a magnificatio...

    Text Solution

    |

  3. In an astronomical telescope in normal adjustment a straight black lin...

    Text Solution

    |

  4. The ratio of the diameter of the sun to the distance between the earth...

    Text Solution

    |

  5. A point object is held above a thin equiconvex lens at its focus. The ...

    Text Solution

    |

  6. A concave lens of glass, refractive index 1.5 has both surfaces of sam...

    Text Solution

    |

  7. Given a point source of light, which of the following can produce a pa...

    Text Solution

    |

  8. choose the correct option

    Text Solution

    |

  9. An infinitely long bar lies alont the adis of cancave mirror of focal...

    Text Solution

    |

  10. Diameter of a plano-convex lens is 6cm and thickness at the centre is ...

    Text Solution

    |

  11. The image of an object, forme by a plano-convex lens at a distance of ...

    Text Solution

    |

  12. By placing a comvex lens of focal length equal to 15.0 cm between an o...

    Text Solution

    |

  13. For a normal eye, the cornea of eye provides a converging power of 40 ...

    Text Solution

    |

  14. A person can see objects clearly only when they lie between 50cm and ...

    Text Solution

    |

  15. The focal length of a plano-convex lens is f and its refractive index ...

    Text Solution

    |

  16. A convex lens of glass (mu(g)=1.45) has focal length f(g) is air. The ...

    Text Solution

    |

  17. Convex lens is made of glass of refractive index 1.5 If the radius of ...

    Text Solution

    |

  18. Relative difference of focal lengths of objective and eye lens in the ...

    Text Solution

    |

  19. Three thin lenses are combined by placing them in contact with each ot...

    Text Solution

    |

  20. If the focal length of the objective lens is increased then

    Text Solution

    |