Home
Class 12
PHYSICS
A converging beam of rays is incident on...

A converging beam of rays is incident on a diverging lens. Having passed through the lens the rays intersect at a point `15 cm` from the lens. If the lens is removed, the point where the rays meet, move `5 cm` closer to the mounting that holds the lens. Find the focal length of the lens.

A

`-30cm`

B

5 cm

C

`10cm`

D

20 cm

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • RAY OPTICS AND OPTICAL INSTRUMENTS

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT (SECTION - D)|16 Videos

  • RAY OPTICS AND OPTICAL INSTRUMENTS

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT (SECTION - B)|35 Videos

  • PHYSICAL WORLD

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT (Section-B)|4 Videos

  • SEMICONDUCTOR ELECTRONICS (MATERIAL, DEVICES AND SIMPLE CIRUITS )

    AAKASH INSTITUTE ENGLISH|Exercise Assignment SECTION - D (Assertion & reason type Question)|10 Videos

Similar Questions

Explore conceptually related problems

A converging beam of rays is incident on a diverging thin lens. Having passed through the lens the rays intersect at a point 15cm from the lens. If lens is removed the point where the rays meet will move 5cm closer towards the mounting that holds the lens. The focal length of lens is

A convex lens forms an image of an object on a screen 30 cm from the lens. When the lens is moved 90 cm towards the object, then the image is again formed on the screen. Then, the focal length of the lens is

A converging beam of light is incident on a concave lens. The beam converges behind the lens at 15 cm from its centre, in the absence of the lens. Select the correct alternative

A converging beam of light is incident on a concave lens of focal length 20 cm. In the absence of the lens, the beam converges at a point 10 m behind the lens. Find where the beam will converge/diverge after refraction.

An object to the left of a lens is imaged by the lens on a screen 30cm to the right of the lens. When the lens is moved 5cm to the right, the screen must be moved 5cm to the left to refocus the images. The focal length of lens is :-

An object O is kept infront of a converging lens of focal length 30 cm behind which there is a plane mirror at 15 cm from the lens.

A converging lens has a focal length of 30 cm. Rays from a 2.0 cm high filament that pass through the lens from a virtual image at a distance of 50 cm from the lens. Where is the filament located? What is the height of the image?

When an object is placed at the proper distance ot the left of a converging lens, the image is focused in a screen 30 cm to the right of lens. A dieverging lens is now placed 15 cm to the right of the converging lens and it is found that the screen must be moved 19.2cm farther to the right to obtain a sharp image. Find the focal length of the diverging lens.

A ray of light AO is incident on a diverging lens as shown in figure. The focal plane of the lens is also given. The possible direction of the refracted ray will be

A convergent beam of light passes through a diverging lens of focal length 0.2 m and comes to focus at a distance of 0.3 m behind the lens. Find the position of the point at which the beam would converge in the absence of the lens.

AAKASH INSTITUTE ENGLISH-RAY OPTICS AND OPTICAL INSTRUMENTS-ASSIGNMENT (SECTION - C)
  1. Which of the following is not due to total internal reflection ?

    Text Solution

    |

  2. A biconvex lens has a radius of curvalure of magnitude 20 cm Which one...

    Text Solution

    |

  3. A converging beam of rays is incident on a diverging lens. Having pass...

    Text Solution

    |

  4. A thin prism of angle 15^(@) made of glass of refractive index mu(1) =...

    Text Solution

    |

  5. A ray of light travelling in a transparent medium of refractive index ...

    Text Solution

    |

  6. A lens having focal length f and aperture of diameter d forms an image...

    Text Solution

    |

  7. The speed of light in media M(1) and M(2) is 1.5xx10^(8) m/s and 2.0x...

    Text Solution

    |

  8. A ray of light is incident on a 60^(@) prism at the minimum deviation ...

    Text Solution

    |

  9. Two thin lenses of focal length f(1) and f(2) are in contact and coaxi...

    Text Solution

    |

  10. A boy is trying to start a fire by focusing sunlight on a piece of pap...

    Text Solution

    |

  11. The frequence of a light wave in a material in 2xx10^(14) Hz and wavel...

    Text Solution

    |

  12. A small coin is resting on the bottom of a beaker filled with a liquid...

    Text Solution

    |

  13. A microscope is focussed on a mark on a piece of paper and then a slab...

    Text Solution

    |

  14. A convex lens and a concave lens, each heaving same focal length of 25...

    Text Solution

    |

  15. A man of height 6 ft wants to see his full image in a plane mirror. Th...

    Text Solution

    |

  16. Images formed by an object placed between two plane mirrors whose ref...

    Text Solution

    |

  17. An object is placed between two plane mirrors inclined at an angle to ...

    Text Solution

    |

  18. In opticle fibres,the refractive index of the core is

    Text Solution

    |

  19. Light travels through a glass plate of thickness t and refractive inde...

    Text Solution

    |

  20. A ray of light from a denser medium strikes a rare medium as shown in ...

    Text Solution

    |