Home
Class 10
PHYSICS
An object 60 cm from a lens gives a virt...

An object 60 cm from a lens gives a virtual image at distance of 20 cm in front lens. What is the focal length of the lens? Is the lens converging or diverging? Give reasons for your answer.

Text Solution

Verified by Experts

`f=-30 cm`, Diverging lens: Negative sign of focal length
Promotional Banner

Topper's Solved these Questions

  • REFRACTION OF LIGHT

    LAKHMIR SINGH & MANJIT KAUR|Exercise LONG ANSWER TYPE QUESTIONS|3 Videos

  • REFRACTION OF LIGHT

    LAKHMIR SINGH & MANJIT KAUR|Exercise SHORT ANSWER TYPE QUESTIONS|1 Videos

  • REFRACTION OF LIGHT

    LAKHMIR SINGH & MANJIT KAUR|Exercise VERY SHORT ANSWER TYPE QUESTIONS|1 Videos

  • REFLECTION OF LIGHT

    LAKHMIR SINGH & MANJIT KAUR|Exercise Very Short Answer Type Questions|1 Videos

  • SOURCES OF ENERGY

    LAKHMIR SINGH & MANJIT KAUR|Exercise NCERT|8 Videos

Similar Questions

Explore conceptually related problems

An object kept 60 cm from a lens gives a virtual image 20 cm in front of the lens. What is the focal length of the lens? Is it a converging lens or diverging lens?

An object kept 60 cm from a lens gives a virtual image 20 cm in front of the lens . What is the focal length and power of the lens ? Is it is converging lens or diverging lens ?

An object kept at 60 cm from a lens gives a virtual image at 20 cm in front of the lens. What is the focal length of the lens ? It it a converging lens or diverging lens ? Also find the magnification produced.

An object placed at 20 cm from a lens, forms an image on a screen placed 60 cm on the other side of the lens. What is the focal length and type of the lens ?

An object placed 10 cm in front of a lens has an image 20 cm behind the lens. What is the power of the lens ( in dioptres ) ?

When an object is placed 40cm from a diverging lens, its virtual image is formed 20cm from the lens. The focal length and power of lens are

An object placed 50 cm from a lens produces a virtual image at a distance of 10 cm in front of the lens. Draw a diagram to show the formation of image. Calculate focal length of the lens and magnification produced.

An object is kept at 60 cm in front of a convex lens. Its real image is formed at 20 cm from the lens . Find the focal length and power of the lens.

LAKHMIR SINGH & MANJIT KAUR-REFRACTION OF LIGHT-Exercise
  1. An object is placed at a distance of 4 cm from a concave lens of focal...

    Text Solution

    |

  2. A concave lens of focal length 15 cm forms an image 10 cm from the len...

    Text Solution

    |

  3. An object 60 cm from a lens gives a virtual image at distance of 20 cm...

    Text Solution

    |

  4. A concave lens of 20 cm focal length forms an image 15 cm from the len...

    Text Solution

    |

  5. A concave lens has focal length of 15 cm. At what distance should an o...

    Text Solution

    |

  6. A concave lens has focal length of 20 cm. At what distance from the le...

    Text Solution

    |

  7. A concave lens has focal length of 20 cm. At what distance from the le...

    Text Solution

    |

  8. An object is placed 15 cm from (alpha) a converging mirror, and (b) a ...

    Text Solution

    |

  9. A 2.0 cm tall object is placed 40 cm from a diverging lens of focal le...

    Text Solution

    |

  10. a) Find the position and size of the virtual image formed when an obje...

    Text Solution

    |

  11. a) A small object is placed 150 mm away from a diverging lens of focal...

    Text Solution

    |

  12. A concave lens produces an image 20 cm from the lens of an object plac...

    Text Solution

    |

  13. Only one of the following applies to a concave lens. This is:

    Text Solution

    |

  14. The magnification produced by a spherical lens and a spherical mirror ...

    Text Solution

    |

  15. An object is 2m from a lens which forms an erect image one-fourth (exa...

    Text Solution

    |

  16. An image formed on a screen is three times the size of the object. The...

    Text Solution

    |

  17. The lens A has a focal length of 25 cm whereas another lens B has a fo...

    Text Solution

    |

  18. Which causes more bending (or more refraction) of light rays passing t...

    Text Solution

    |

  19. Name the physical quantity whose limit unit is dioptre.

    Text Solution

    |

  20. Define one dioptre of power of a lens.

    Text Solution

    |