Home
Class 10
PHYSICS
What is the sign of focal length of a co...

What is the sign of focal length of a concave lens?

Promotional Banner

Topper's Solved these Questions

  • REFLECTION AND REFRACTION

    MODERN PUBLICATION|Exercise EXAMPLE|138 Videos

  • MAGNETIC EFFECTS OF ELECTRIC CURRENT

    MODERN PUBLICATION|Exercise EXERCISE|265 Videos

  • SOURCES OF ENERGY

    MODERN PUBLICATION|Exercise EXAMPLE|92 Videos

Similar Questions

Explore conceptually related problems

A concave lens is placed in contact with a convvex lens of focal lenght 25 cm.the combinatin produces a real image at a distance of 80 cm,when the object is at a distance of 40 cm.What is the focal length of the concave lens?

What is the focal length of a convex lens of focal length 30cm in contact with a concave lens of focal length 20cm? Is the system a converging or a diverging lens? Ignore thickness of the lenses.

A concave lens is placed in contact with a convex lens of focal length 25 cm.The combination produces a real image at adistance of 80 cm, when an object is at a distance of 40 cm. What is the focallength of concave lens ?

If f_v and f_r are the focal lengths of a convex lens fro violet and red light respectively and F_v and F_r are the respective focal length of a concave lens,then we must have

Define focal length of a lens

What changes in the focal length of a concave mirror when the incident violet light on them is replaced by red light?

What happens to focal length of a concave mirror when immersed in water ?

MODERN PUBLICATION-REFLECTION AND REFRACTION-EXAMPLE
  1. What is the sign of focal length of a concave lens?

    Text Solution

    |

  2. A concave mirror of focal length 20 cm forms a real image at a distanc...

    Text Solution

    |

  3. A convex mirror used on an automobile has a radius of curvature of 3 m...

    Text Solution

    |

  4. An object 1 cm high is place on the axis and 15 cm from a concave mirr...

    Text Solution

    |

  5. The image formed by a concave mirror is half in size of the object. If...

    Text Solution

    |

  6. An object 5 cm high is placed at a distance of 10 cvm from a convex mi...

    Text Solution

    |

  7. When an object is placed at a distance of 60 cm from a convex spherica...

    Text Solution

    |

  8. Find the position of an object which when placed in front of a concave...

    Text Solution

    |

  9. An object is placed 10 cm from a concave mirror of radius of curvature...

    Text Solution

    |

  10. An object is placed 15 cm from a convex mirror of radius of curvature ...

    Text Solution

    |

  11. A 4.5 cm needle is placed 12 cm away from a convex mirror of focal len...

    Text Solution

    |

  12. What is the speed of light?

    Text Solution

    |

  13. If refractive index of glass w.r.t. air is 1.55, then what is the refr...

    Text Solution

    |

  14. The refractive index of water is 4/3 and flint glass is 1.65. What is ...

    Text Solution

    |

  15. A ray of light passes from to air to glass at an angle of incidence of...

    Text Solution

    |

  16. Monochromatic light of wavelength 589 nm is incident from air on a wat...

    Text Solution

    |

  17. The refractive index of diamond is 2.42 and that of glass is 1.5. find...

    Text Solution

    |

  18. A ray of light of frequency of 5 xx 10^(14)Hz is passed through a liqu...

    Text Solution

    |

  19. Velocity of light in a medium is 1.5xx10^8 ms^-1. Find the refractive ...

    Text Solution

    |

  20. The refractive index of diamond is:

    Text Solution

    |

  21. A ray of light passes from air to glass. The glass of incidence is 45^...

    Text Solution

    |