Home
Class 11
PHYSICS
A plano-convex lens is made of glass of ...

A plano-convex lens is made of glass of refractive index 1.5. The radius of curvature of its convex surface is R. Its focal length is

A

`R/2`

B

R

C

2R

D

1.5R

Text Solution

Verified by Experts

The correct Answer is:
C
`1/f(1.5-1)[1/R-1/(oo)]`
`f=R/0.5`
f=2R
Promotional Banner

Topper's Solved these Questions

  • FULL TEST 3

    RESONANCE ENGLISH|Exercise Exercise|30 Videos

  • GRAVITATION

    RESONANCE ENGLISH|Exercise Exercise|21 Videos

Similar Questions

Explore conceptually related problems

A plano-concave lens is made of glass of refractive index 1.5 and the radius of curvature of its curved face is 100 cm. What is the power of the lens?

A concavo-convex lens is made of glass of refractive index 1.5. The radii of curvature of its two surfaces are 30 cm and 50 cm. Its focal length when placed in a liquid of refractive index 1.4 is

The radius of curvature of a convex mirror is 40 cm. Find its focal length.

The plane surface of a plano-convex lens of refracting index 1.5, is silvered. The radius of curvature of curved surface is R. Find the focal length of the mirror thus formed.

A planocovex lens is made of a material of refractive in mu=1.5 The radius of curvature of curved surface of the lens is 20.cm. If its plane surface3 is silvered, the focal length of the silvered lens will be

A plano-convex lens is made of refractive index of 1.6. The focal length of the lens is

The convex side of a thin concavo-convex lens of glass of refractive index 1.5 has a radius of curvature of 20cm. The concave surface has a radius of curvature of 60cm. What is the focal length of the lens? The convex side is silvered and placed on a horizontal surface. What is the effective focal length of the silvered lens? The concave part is filled with water with refractive index 1.33. What is the effective focal length of the combined glass and water lens? If the convex side is silvered what is the new effective focal length of the silvered compound lens?

A convexo-concave convergent lens is made of glass of refractive index 1.5 and focal length 24 cm. Radius of curvature for one surface is double than that of the other. Then,radii of curvature for the two surfaces are (in cm)

A convex-concave diverging lens is made of glass of refractive index 1.5 and focal length 24 cm. radius of curvature for one surface is double that of the other. Then radii of curvature for the two surfaces are (in cm )

A double convex thin lens made of glass of refractive index 1.6 has radii of curvature 15 cm each. The focal length of this lens when immersed in a liquid of refractive index 1.63 is :

RESONANCE ENGLISH-GEOMETRICAL OPTICS-Exercise
  1. A light waves travels from glass to water. The refractive index for gl...

    Text Solution

    |

  2. When a beam of light goes from denser medium (m(d)) to rarer medium (m...

    Text Solution

    |

  3. The image for the converging beam after refraction through the curved ...

    Text Solution

    |

  4. A thin linear object of size 1mm is kept along the principal axis of a...

    Text Solution

    |

  5. A medium has nv = 1.56, nr=1.44. Then its dispersive power is:

    Text Solution

    |

  6. A Galileo telescope has an objective of focal length 100cm and magnif...

    Text Solution

    |

  7. A convex lens of focal length A and a concave lens of focal length B a...

    Text Solution

    |

  8. Two convex lens, of focal length 25 cm and 20 cm respectively are put ...

    Text Solution

    |

  9. When the distance between the object and the screen is more than 4 f....

    Text Solution

    |

  10. A plano-convex lens is made of glass of refractive index 1.5. The radi...

    Text Solution

    |

  11. An astronomical telescope has an angular magnification of magnitude 5 ...

    Text Solution

    |

  12. In order to decrease the magnifying power of a telescope

    Text Solution

    |

  13. An opera glass (Galilean telescope ) measures 9cm from the objective t...

    Text Solution

    |

  14. The numerical value of the length of Galilean telescope for normal vis...

    Text Solution

    |

  15. The magnifying power of compound microscope in terms of the magnificat...

    Text Solution

    |

  16. In a simple microscope, if the final image is located at infinity then...

    Text Solution

    |

  17. An achromatic combination of lenses is formed by joining

    Text Solution

    |

  18. In a simple microscope, if the final image is located at 25 cm from th...

    Text Solution

    |

  19. STATEMENT -1: There exists two angles of incidence for the same deviat...

    Text Solution

    |

  20. STATEMENT-1: A lens has two principal focal lengths which may be diffe...

    Text Solution

    |