Home
Class 11
PHYSICS
Three thin lenses are combined by placin...

Three thin lenses are combined by placing them in contact with each other to get more magnification in an optical instrument. Each lens has a focal length of 3 cm. If the lens, distance of distinct vision is taken as 25 cm, the total magnification of the lens combination in normal adjustment is

A

9

B

26

C

300

D

3

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • Motion in a plane

    TARGET PUBLICATION|Exercise Exercise|340 Videos

  • RAY OPTICS

    TARGET PUBLICATION|Exercise EVALUATION TEST|16 Videos

Similar Questions

Explore conceptually related problems

Three thin lenses are combined by placing them in contact with each other to get more magnification in an optical instrement. Each lens has a focal length of 3 cm. If the least distance of distinct vision is taken as 25 cm, the total magnification of the lens combination in normal adjustment is

An object is kept at 60 cm in front of a convex lens of focal length 15 cm . Find the image distance and the nature of the image . Also find the magnification produced by the lens.

If two convex lenses of focal lengths 10 cm and 5 cm are kept in contact with each other , What is their combined focal length ?

Two thin converging lenses of focal length 15 cm and 30 cm are held in contact with each other. The focal length of the combination is

when an object is kept in frnt of a convex lens the distance between it and the real image is 54 cm. if the magnification produced is 2, the focal length of the lens is

A concave lens and a convex lens have same focal length of 20 cm and both put in contact this combination is used to view an object 5 cm long kept at 20 cm from the lens combination. As compared to object the image will be

The focal length of convex lens is 20 cm. If an object of height 4 cm is placed at a distance of 30 cm from the lens, find: The magnification produced by the lens.

Two thin lenses, aone convex of focal length 10 cm and other concave lens are kept in contact to form a composite lens of focal length 13 cm . If the combination acts as a converging lense the focal length of second lens is

A comvex lens and a concave lens are placed in contact. The ratio of magnitude of the power of the convex lens to that of the concave lens is 4:3. If the focal length of the convex lens is 12 cm, then the focal length of the combination will be

Fill in the blanks : If two lenses with focal lengths 10cm and 20 cm respectively are kept in contact with each other , the effective power of the combination is ………….

TARGET PUBLICATION-OPTICS-EXERCISE
  1. The focal length of a plano-convex lens is f and its refractive index ...

    Text Solution

    |

  2. A convex lens is made of a glass of refractive index 1.5. The radius o...

    Text Solution

    |

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

    Text Solution

    |

  4. When image is fomred by reflaction, the field of veiw is maximum for

    Text Solution

    |

  5. A candle flame 2 cm high is palced at distance of 2 metere from a wall...

    Text Solution

    |

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

    Text Solution

    |

  7. Radius of the circle of least confusion is called as .

    Text Solution

    |

  8. Assertion : If objective and eye lens of a mcroscope are interchanged ...

    Text Solution

    |

  9. A convex lens focal lenghts 30 cm made of glass of refractive index 1....

    Text Solution

    |

  10. Magnifying power of a telescope in normal adjustment when final images...

    Text Solution

    |

  11. Two plano-concave lenses (1 and 2) of glass of refractive index 1.5 ha...

    Text Solution

    |

  12. Assertion : If radius of curvature of mirror is doubled, focal length ...

    Text Solution

    |

  13. Assertion : A dentist uses a convex mirror to examine a small cavity i...

    Text Solution

    |

  14. For a given compound microscope, increase in length of tube

    Text Solution

    |

  15. A light ray enters a solid glass sphere of refractive index sqrt3 at a...

    Text Solution

    |

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

    Text Solution

    |

  17. Which of the following (referred to a spherical mirror) do (does) not ...

    Text Solution

    |

  18. In optical fibre, assuming, the cladding is uniform, light is transmi...

    Text Solution

    |

  19. Light propagates 4 cm distance in glass of refractive index 1.5 in tim...

    Text Solution

    |

  20. A transparent solid cylindrical rod has a refractive index of (frac(2)...

    Text Solution

    |