Home
Class 12
PHYSICS
Two identical thin planoconvex glass len...

Two identical thin planoconvex glass lenses (refractive index 1.5) each having radius of curvature of 20 cm are placed with their convex surfaces in contact at the centre. The intervening space is filled with oil of refractive index 1.7 The focal length of the combination is

A

`-20 cm`

B

`-25 cm`

C

`-50 cm`

D

50 cm

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • NTA NEET TEST 101

    NTA MOCK TESTS|Exercise PHYSICS|45 Videos

  • NTA NEET TEST 103

    NTA MOCK TESTS|Exercise PHYSICS|45 Videos

Similar Questions

Explore conceptually related problems

Two identical thin plano-convex glass lensses (refractive index 1.5) each having radius of curvature of 20 cm are jplaced with their convex suffaces in contact at the cenjtre. The intervening space is filled with oil of refractive index 1.7 The focal length of the combination is

A concavo-convex lens has refractive index 1.5 and the radii of curvature of its surfaces are 10 cm and 20 cm. The concave surface is upwords and is filled with oil of refractive index 1.6. The focal length of the combination will be

A plano-convex lens has refractive index 1.6 and radius of curvature 60 cm. What is the focal length of the lens?

Two plano concave lenses of glass of refractive index 1.5 have radii of currature 20cm and 30cm respectively. They are placed in contact with the curved surface to wards each other and the space between them is filled with a liquid of refractive index 3. The focal length of the combination is (in cm) (A) 12 (B) 16 (C) -92

Two plano concave lenses of glass of refractive index 1.5 have radii of currature 20cm and 30cm respectively.They are placed in contact with the curved surface to wards each other and the space between them is filled with a liquid of refractive index (5)/(2) . The focal length of the combination is (in cm)

Two plano-concave lenses of glass of refractive index 1.5 have radii of curvature of 20 and 30 cm. They are placed in contact with curved surface towards each other and the space between them is filled with a liquid of refractive index (4)/(3) , find the focal length of the system.

Two plano-concave lenses of glass of refractive 1.5 have radii of curvature of 20 and 30 cm. They are placed in contact with curved surface towards each other and the space between yhem is filled with a liquid of refractive index 2/3. Find the focal length of the system.

Two plano-concave lenses (1 and 2) of glass of refractive index 1.5 have radii of curvature 25 cm and 20 cm. They are placed in contact with their curved surface towards each other and the space betweent hem is filled with liquid of refractive index (4)/(3) the the combination is

NTA MOCK TESTS-NTA NEET TEST 102-PHYSICS
  1. A simple spring has length l and force constant K. It is cut into two ...

    Text Solution

    |

  2. A mass is suspended from a vertica spring which is executing SHM of fr...

    Text Solution

    |

  3. Ultraviolet light of wavelength 300nn and intensity 1.0Wm^-2 falls on ...

    Text Solution

    |

  4. when a monochromatic point source of light is at a distance 0.2 m from...

    Text Solution

    |

  5. The cylindrical tube of a spray pump has a cross-section of 8 cm^2, on...

    Text Solution

    |

  6. A big water drop is formed by the combination of 'n' small water dr...

    Text Solution

    |

  7. A fish looking up through the water sees the outside world contained i...

    Text Solution

    |

  8. Two identical thin planoconvex glass lenses (refractive index 1.5) eac...

    Text Solution

    |

  9. A smooth uniform rod of length L and mass M has two identical beads of...

    Text Solution

    |

  10. A disc of mass M and radius R has a spring of constant k attached to i...

    Text Solution

    |

  11. p-type semiconductor is

    Text Solution

    |

  12. For the expression P = X + XY , how many gates are required for its im...

    Text Solution

    |

  13. One mole of ideal gas goes through processP = (2V^2)/(1+V^2). Then ch...

    Text Solution

    |

  14. If the error in measuring the radius of the sphere is 2% and that in m...

    Text Solution

    |

  15. In the experiment of diffraction at a single slit, if the slit width i...

    Text Solution

    |

  16. Two polaroids are kept crossed to each other . If one of them is rotat...

    Text Solution

    |

  17. The ratio of speed of sound in neon to that in water vapours at any te...

    Text Solution

    |

  18. Find beat frequency if the motion of two particles is given by y1=0....

    Text Solution

    |

  19. A particle moves from position r1=(3hati+2hatj-6hatk) m to position r...

    Text Solution

    |

  20. A particle of mass 0.1 kg is subjected to a force which varies with di...

    Text Solution

    |