Home
Class 10
PHYSICS
A 10 mm long apline is placed vertically...

A 10 mm long apline is placed vertically in fornt of a concave mirror. A 5 mm long image of the alpin is formed at 30 cm in fornt of the mirro. The focal length of this mirror is

A

`-30 cm`

B

`-20 cm`

C

`-40 cm`

D

`-60 cm`

Text Solution

Verified by Experts

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

When an object is placed beyond centre of curvature of a concave mirror, the image is formed:

An object is placed in front of a convex mirror of focal length 30 cm.If the image formed is a quarter of the size of the object,find the position of the image.

An objects is placed at a distance equal to focal length of convex mirror.If the focal length of the irror be f,then the distance of the image from the pole of the mirror is:

An object is placed in front of a concave mirror of radius of curvature 40 cm at a distance of 10 cm.Find the position and magnification of the image.

A small candle, 2.5 cm in size is placed at 27 cm in front of a concave mirror of radius of curvature 36 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Describe the nature and size of the image. If the candle is moved closer to the mirror, how would the screen have to be moved?

An object of height 5cm is placed 200cm in front of concave mirror of radius of curvature 40 cm. Find the size of the image.

An object placed 12 cm from the pole of a concave mirror produces a real image magnified four times.Find the radius of curvature of the mirror.

MODERN PUBLICATION-REFLECTION AND REFRACTION-EXAMPLE
  1. A 10 mm long apline is placed vertically in fornt of a concave mirror....

    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

    |