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 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

A

9

B

26

C

300

D

3

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • RAY OPTICS

    TARGET PUBLICATION|Exercise EVALUATION TEST|14 Videos
  • RAY OPTICS

    TARGET PUBLICATION|Exercise CRITICALTHINKING|34 Videos
  • MEASUREMENTS

    TARGET PUBLICATION|Exercise EVALUATION TEST|17 Videos
  • REFRACTION OF LIGHT

    TARGET PUBLICATION|Exercise EVALUATION TEST|12 Videos

Similar Questions

Explore conceptually related problems

The maximum magnification that can be obtained with a convex lens of focal length 2.5 cm is (the least distance of distinct vision is 25 cm )

The maximum magnification that can be obtained with a convex lens of focal length 2.5 cm is (the Ieast distance of distinct vision is 25 cm).

A simple microscope has a focal length of 5 cm . The magnification at the least distince of distinct vision is-

Magnification of a compound microscope is 30. Focal length of eye - piece is 5 cm and the image is formed at a distance of distinct vision of 25 cm . The magnificatio of the objective lens is

The magnifying power of a simple microscope is 6. The focal length of its lens in metres will be, if least distance of distinct vision is 25cm

Two thin lenses of power + 3 D and - 1 D are held in contact with each other. Focal length of the combination is :

Two lenses are placed in contact with each other and the focal length of combination is 80 cm . If the focal length of one is 20 cm , then the power of the other will be

Two thin lenses of focal lengths 20 cm and -20 cm are placed in contact with other. The combination has a focal length equal to

TARGET PUBLICATION-RAY OPTICS-COMPETITIVE THINKING
  1. To avoid spherical aberration, quality reflecting telescopes use mirro...

    Text Solution

    |

  2. An astronomical telesope has objective and eyepiece of focal lengths 4...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  9. An infinitely long rod lies along the axis of a concave mirror of foca...

    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

    |