Home
Class 12
PHYSICS
A ocnverging bem of light forms of a sh...

A ocnverging bem of light forms of a sharp image on a screen. lens is placed in the path of the beam at 10 cm from the screen.It si found that screen has to be moved 8 cm further away from the lens to obtain a sharp image.Find the focal length and natrue of the lens.

Promotional Banner

Topper's Solved these Questions

  • REFRACTION OF LIGHT

    MODERN PUBLICATION|Exercise EXERCISE|168 Videos

  • REFLECTION OF LIGHT

    MODERN PUBLICATION|Exercise EXERCISE|57 Videos

  • SEMICONDUCTOR DEVICES

    MODERN PUBLICATION|Exercise EXERCISE|174 Videos

Similar Questions

Explore conceptually related problems

A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam 12cm from P. At what point does the beam converge if the lens is: a convex lens of focal length 20cm?

If the distance between the screen and object is 50 cm and the displacement of the lens is 10 cm,clculate the focal length of the lens.

A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam 12cm from P. At what point does thebeam converge if the lens is: a concave lens of focal length 16cm?

A screen is placed 80 cm from an object. The image of the object on the screen is formed by a convex lens placed between them at two different locations separated by a distance 20 cm. Determine the focal length of the lens.

The image of needle placed 45 cm from a lens is formed on a screen placed 90 cm on the otehr side of teh lens.Find the displacement of the image,if the object is moved to 5.0 cm away from the lens.

A screen is placed 90cm from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by 20cm. Determine the focal length of the lens.

A convex lens is used to obtain a magnified image of an object on a screen 10 m from the lens .If the magnification is 19,find the foal length of the lens.

An object is placed at a distance of 75 cm from a screen .Where should a convex lens of focal length 12 cm be placed so as to obtain on the screen?

MODERN PUBLICATION-REFRACTION OF LIGHT-EXERCISE
  1. A 5.0 cm long needle is placed vertically at a distance 20 cm in front...

    Text Solution

    |

  2. A convex lens of foal length 30 cm and a concave lens of focal length ...

    Text Solution

    |

  3. A ocnverging bem of light forms of a sharp image on a screen. lens is...

    Text Solution

    |

  4. An object is placed at a distance of 75 cm from a screen .Where should...

    Text Solution

    |

  5. The image of needle placed 45 cm from a lens is formed on a screen pl...

    Text Solution

    |

  6. If the distance between the screen and object is 50 cm and the displac...

    Text Solution

    |

  7. A convex lens of focal lenght 20 cm is placed coaxially wih a convex m...

    Text Solution

    |

  8. An object is placed at a distance 5 cm from a convex lens of focal len...

    Text Solution

    |

  9. Where should an object placed from a conveging lens of focal length 20...

    Text Solution

    |

  10. Calculate the distance at which an object should be placed in front of...

    Text Solution

    |

  11. At what distance should be placed from a convex lens of focal length 1...

    Text Solution

    |

  12. A lens placed at a distance of 20 cm from an object produces a virtual...

    Text Solution

    |

  13. The image obtained with a convex lens is erect and its lenth is four t...

    Text Solution

    |

  14. An object is placed at a distance of 1.5 m from a screen and a convex...

    Text Solution

    |

  15. Two lenses of powers +4 D and -14 D form a combination.If a 2 cm size ...

    Text Solution

    |

  16. An iluminated object and a screen are placed 90 cm apart.Determine the...

    Text Solution

    |

  17. A convex lens is used to obtain a magnified image of an object on a sc...

    Text Solution

    |

  18. The image obtained iwth a convex lewns is ereect and its length is fou...

    Text Solution

    |

  19. A lens of focal length 12 cm forms an upright image three times the si...

    Text Solution

    |

  20. A lens of focal length 12 cm produces a virtual image,whose linear dim...

    Text Solution

    |