Home
Class 12
PHYSICS
Double-convex lenses are to be manufactu...

Double-convex lenses are to be manufactured from a glass of refractive index 1.55, with both faces of the same radius of curvature. What is the radius of curvature required if the focal length is to be 20cm?

Text Solution

Verified by Experts

R = 22cm
Promotional Banner

Topper's Solved these Questions

  • RAY OPTICS AND OPTICAL INSTRUMENTS

    NCERT GUJARATI|Exercise EXERCISES|40 Videos

  • NUCLEI

    NCERT GUJARATI|Exercise ADDITIONAL EXERCISES|9 Videos

  • SEMICONDUCTOR ELECTRONICS: MATERIALS, DEVICES AND SIMPLE CIRCUITS

    NCERT GUJARATI|Exercise ADDITIONAL EXERCISES|8 Videos

Similar Questions

Explore conceptually related problems

A concave lens of glass, refractive index 1.5 has both surfaces of same radius of curvature R. On immersion in a medium of refractive index 1.75, it will behave as a

Radius of curvature of a concave mirror is 20 cm, then its focal length is ...... cm.

The adjacent figure shows a thin plano-convex lens of refractive index mu_1 and a thin plano-concave lens of refractive index mu_2 , both having same radius of curvature R of their curved surfaces. The thin lens of refractive index mu_3 has radius of curvature R of both its surfaces. This lens is so placed in between the plano-convex and plano-concave lenses that the plane surfaces are parallel to each other. The focal length of the combination is

In the figure, light is incident on a thin lens as shown. The radius of curvature for both the surfaces is R. Determine the focal length of this system.

A pin is placed 10cm in front of a convex lens of focal length 20cm, made of a material having refractive index 1.5 . The surface of lens farther away from the pin is silvered and has a radius of curvature 22cm. Determine the position of the final image. Is the image real or virtual?

Obtain the relative between object distance and image distance in terms of refractive index of medium and radius of curvature for spherically curved surface.

A concave or convex lens is given such that radii of curvature are same. If refractive index of glass is 1.5, then its focal length = ...... where R = radius of curvature.

A plano-convex lens of radius of curvature 30 cm and refractive index 1.5 is kept in air. Find its focal length (in cm).

NCERT GUJARATI-RAY OPTICS AND OPTICAL INSTRUMENTS-EXERCISES
  1. A small bulb is placed at the bottom of a tank containing water to a d...

    Text Solution

    |

  2. A prism is made of glass of unknown refractive index. A parallel beam ...

    Text Solution

    |

  3. Double-convex lenses are to be manufactured from a glass of refractive...

    Text Solution

    |

  4. A beam of light converges at a point P. Now a lens is placed in the pa...

    Text Solution

    |

  5. An object of size 3.0cm is placed 14cm in front of a concave lens of f...

    Text Solution

    |

  6. What is the focal length of a convex lens of focal length 30cm in cont...

    Text Solution

    |

  7. A compound microscope consists of an objective lens of focal length 2....

    Text Solution

    |

  8. A person with a normal near point (25 cm) using a compound microscope ...

    Text Solution

    |

  9. A small telescope has an objective lens of focal length 144cm and an e...

    Text Solution

    |

  10. (a) A giant refracting telescope at an observatory has an objective le...

    Text Solution

    |

  11. Use the mirror equation to deduce that: (a) an object placed between...

    Text Solution

    |

  12. A small pin fixed on a table top is viewed from above from a distance ...

    Text Solution

    |

  13. (a) Figure 9.32 shows a cross-section of a 'light pipe' made of a glas...

    Text Solution

    |

  14. Answer the following questions: (a) You have learnt that plane and c...

    Text Solution

    |

  15. Answer the following questions: (b) A virtual image, we always say, ...

    Text Solution

    |

  16. Answer the following questions: (c) A diver under water, looks obliq...

    Text Solution

    |

  17. Answer the following questions: (d) Does the apparent depth of a tan...

    Text Solution

    |

  18. Answer the following questions: (e) The refractive index of diamond ...

    Text Solution

    |

  19. The image of a small electric bulb fixed on the wall of a room is to b...

    Text Solution

    |

  20. A screen is placed 90cm from an object. The image of the object on the...

    Text Solution

    |