Home
Class 11
PHYSICS
A convex lens of focal length f produces...

A convex lens of focal length f produces a real image 3 times as that of size of the object, the distance between the object and the lens is

A

`-(frac(2f)(3))`

B

`-(frac(3f)(4))`

C

`-(frac(4f)(3))`

D

`-(frac(3f)(2))`

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

A concave lens of focal length f produces an image (1)/(4) of the size of the object, the object should be kept at ____ from the lens.

An object is kept in front of a concave mirror of focal length 15 cm. The image formed is three times the size of the object. The two possible distances of the object are

A lens with a focal length of 25 cm produces real image of an object at a distance of 50 cm from the lens. At what distance the object placed from the lens?

An object is placed in front of a convex mirror of focal length 60 cm. If image formed is half the size of the object, the position of the image

Answer the following questions : An object is kept in front of a lens of focal length +10 cm . Describe the nature of the image in the following casses : the object distance in 25 cm the object distance in 5 cm.

Focal length of a convex lens is 20 cm and its R.I. is 1.5. It produces an erect, enlarged image if the distance from the object of the lens is

The image of an object, forme by a plano-convex lens at a distance of 8m behind the lens, is real and is one-third the size of the object. The wavelength of light inside the lens is (2)/(3) times the wavelength is free space. The radius of the curved surface of the lens is

Find the focal length of a convex lens which produces a virtual image at 10 cm from the lens when an object is placed at 5 cm from the lens .

Read the following paragraph and answer the following questions given below it : Construction of a compound microscope : (i) Acompound microscope consists of a metal tube fitted with two convex lenses at the two ends. These lenses are called the objective lens ( the lens directed towards the object ) and the eyepiece ( the lens directed towards the eye ). Both the lenses are small in size , but the cross section of the objective lens has a short focal length . the focal length of the eyepiece is more than that of the objective lens . (ii) The metal tube is mounted on a stand . thr principal axes of the objective lens and the eyepiece are along the same line . The distance between the object and objective lens can be changed with a screw . It is possible to change the distance between the objective lens and the eyepiece. Working : (i) The object to be observed is illuminated and placed in front of the objective lens. slightly beyond the focal length of the objective lens. it's real , inverted and enlarged image is formed by the objective lens on the other side. (ii) This intermediate image lies with in the focal length of the eyepiece. It serves as an object for the eyepiece. The eyepiece works as a simple microscope . the final image is virtual, highly enlarged and inverted with respect to the original object . It can be formed at the minimum distance of distinct vision from the eyepiece . The final image is observed by keeping the eye close to the eyepiece. Use: This microscope is used to observe blood cells , microorganisms , etc. In a compound microscope , which lens has greater focal length ?

TARGET PUBLICATION-OPTICS-EXERCISE
  1. A beam of light is incident on a convex lens nparallel to its principa...

    Text Solution

    |

  2. An object is kept at 0.2 m from a convex lens of focal length of 0.15 ...

    Text Solution

    |

  3. A convex lens of focal length f produces a real image 3 times as that ...

    Text Solution

    |

  4. when an object is kept in frnt of a convex lens the distance between i...

    Text Solution

    |

  5. What is the focal length of double convex lens for which radius of cur...

    Text Solution

    |

  6. A plano-convex lens has focal length of 20 cm. the radius of its sph...

    Text Solution

    |

  7. The focal length of concave lens, accroding to new Cartesiaon sign co...

    Text Solution

    |

  8. A diverging lens may NOT have

    Text Solution

    |

  9. A concave lens of focal length f produces an image (1)/(4) of the size...

    Text Solution

    |

  10. A concave lens has radioi of curvatures of 20 cm and 30 cm respective...

    Text Solution

    |

  11. The radius of curvature of each surface of a biconcave lens made up of...

    Text Solution

    |

  12. A single lens, which will form the image of a given object at the same...

    Text Solution

    |

  13. Two thin lenses may be combined so as to

    Text Solution

    |

  14. Two thin lenses with focal lenghts f(1) and f(2) make a lens of focal ...

    Text Solution

    |

  15. Two thin converging lenses of focal length 15 cm and 30 cm are held i...

    Text Solution

    |

  16. What is the focal of the combination of a convex lens of focal length...

    Text Solution

    |

  17. Two thin lenses, aone convex of focal length 10 cm and other concave l...

    Text Solution

    |

  18. Two lenses of power +12and-2 dioptres are placed in contact. What will...

    Text Solution

    |

  19. When two or more lnses of magnification m(1) ,m(2), m(3) are kept in c...

    Text Solution

    |

  20. The separation of whtie light into its constituent colours after passi...

    Text Solution

    |