Home
Class 12
PHYSICS
An object 2.4 m in front of a lens forms...

An object 2.4 m in front of a lens forms a sharp image on a film 12 cm behind the lens. A glass plate 1 cm thick, of refractive index 1.50 is interposed between lens and film with its plane faces parallel to film. At what distance (from lens) should object shifted to be in sharp focus of film?

A

7.2 m

B

2.4 m

C

3.2 m

D

5.6 m

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • GEOMETRICAL OPTICS

    MOTION|Exercise Exercise - 4 | Level-II|55 Videos

  • GEOMETRICAL OPTICS

    MOTION|Exercise EXERCISE - 3 Level II (Section - M Chromatic Aberration and Achromatism, Optical Instrument + Eye + Luminous Intensity)|3 Videos

  • FLUID

    MOTION|Exercise Exercise-4 level-II|5 Videos

  • GRAVITATION

    MOTION|Exercise Exercise - 4 Section - B Previous Years Problems|15 Videos

Similar Questions

Explore conceptually related problems

An object 240 cm in front of a lens forms a sharp image on a screen 12 cm behind the lens. A glass slab 1 cm thick, having refractive index 1.50 is placed between the lens and the screen with its refracting faces perpendicular to the principal axis of the lens. (a) By how much distance the object must be moved so as to again cast a sharp image on the screen? (b) Another identical glass slab is interposed between the object and the lens. How much further the object shall be moved so as to form a sharp image on the screen.

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 ) ?

An object is placed 12cm in front of a lens to form an image on a screen. The size of the image is twice that of the object. What is the distance between the object and the image?

A point object is placed at a distance of 25 cm from a convex lens of focal length 20cm. If a glass slab of thickness t and refractive index 1.5 is inserted between the lens and the object, the image is formed at infinity. The thickness t is

A point object is placed at a distance of 25cm from a convex lens of focal length 20cm .If a glass slab of thickness t and refractive index 1.5 is inserted between the lens and object.The image is formed at infinity .Find the thickness?

A point object O is placed at a distance of 41 cm from a convex lens of focal length f = 20 cm on its principal axis. A glass slab of thickness 3 cm and refractive index mu = 1.5 is placed between the lens and the object with its faces perpendicular to the principal axis of the lens. Image of the object is formed at point I_(1) . Now the glass slab is tilted by an angle of theta = 1° (as shown in the Figure) and the final image is formed at I_(2) . Calculate the distance between points I_(1) and I_(2) . Consider only paraxial rays for the lens and near normal incidence for the glass slab.

A point object is placed at a diatance of 25 cm from a convex lens of focal length 20 cm. If a glass slab of thickness t and refractive index 1.5 is inserted between the lens and the object, the image is formed at infinity. The thickness t is

A point object is placed at a distance of 25cm from a convex lens. Its focal length is 22cm. A glass slab of refractive index 1.5 is inserted between the lens and the object, then the image is formed at infinity. Find the thickness of the glass slab (in cm).

A point object is placed at a distance 25cm from a convex lens of focal length 20cm. If a glass slab of thickness t annd refractive index 1.5 is inserted between the lens and object, image is formed at . Thickness t is found to be K times of 5cm. Fink K.

Focal length of an equiconvex lens is 20 cm. The refractive index of material of the lens is 1.5. Now one of the curved surface is silvered. At what distance from the lens an object is to be placed, so that image coincides with the object ?

MOTION-GEOMETRICAL OPTICS-Exercise - 4 | Level-I
  1. Two lenses of power -15D and +5 D are in contact with each other. The ...

    Text Solution

    |

  2. A student measures the focal length of a convex lens by putting an obj...

    Text Solution

    |

  3. In an optics experiment, with the position of the object fixed, a stud...

    Text Solution

    |

  4. A transparent solid cylinder rod has a refractive index of 2/sqrt(3). ...

    Text Solution

    |

  5. As the beam enters the medium, it will

    Text Solution

    |

  6. The speed of light in the medium is

    Text Solution

    |

  7. A beaker contains water up to a height h(1) and kerosene of height h(2...

    Text Solution

    |

  8. When monochromatic red light is used instead of blue light in a convex...

    Text Solution

    |

  9. Statement-1 : On viewing the clear blue portion of the sky through a C...

    Text Solution

    |

  10. Let the x-z plane be the boundary between two transparent media. Mediu...

    Text Solution

    |

  11. A car is fitted with a convex side-view mirror of focal length 20 cm. ...

    Text Solution

    |

  12. An object 2.4 m in front of a lens forms a sharp image on a film 12 cm...

    Text Solution

    |

  13. The graph between angle of deviation (delta) and angle of incidence (i...

    Text Solution

    |

  14. A thin convex lens made from crown glass (mu = 3//2) has focal length ...

    Text Solution

    |

  15. A green light is incident from the water to the air - water interface ...

    Text Solution

    |

  16. On a hot summer night, the refractive index of air is smallest near th...

    Text Solution

    |

  17. Monochromatic light is incident on a glass prism of angle A. If the re...

    Text Solution

    |

  18. An obsever looks at a distant tree of height 10m with a telescope of m...

    Text Solution

    |

  19. In an experiment for determination of refractive index of glass of a p...

    Text Solution

    |

  20. A diverging lens with magnitude of focal length 25 cm is placed at a d...

    Text Solution

    |