Home
Class 12
PHYSICS
A convex lens of focal lengths 30 cm pr...

A convex lens of focal lengths 30 cm produces 5 times magnified real image of an object What is the object distance ?

A

36 cm

B

25 cm

C

30 cm

D

150 cm

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • QUESTION PAPER 2010

    WB JEE PREVIOUS YEAR PAPER|Exercise PHYSICS|45 Videos
  • QUESTION PAPER 2012

    WB JEE PREVIOUS YEAR PAPER|Exercise Subject: Physics|38 Videos

Similar Questions

Explore conceptually related problems

A concave mirror of focal length 15 cm forms an image twice the size of the object. If the image is virtual, the distance of object is

A convex lens produces a real image double the size of the object, when the object is placed at a distance 18 cm from it. Where should the object be placed to produce a real image three times the size of the object?

An object placed in front of a concave mirror at a distance of x cm from the pole gives a 3 times magnified real image. If it is moved to a distance of (x+5) cm, the magnification of the image becomes 2. The focal length of the mirror is

Two convex lenses of focal length 1.5 cm and 9 cm are arranged to form a microscope . A small object is placed 1.8 cm from the objective. If the image appears to be 37.5 cm from the eyepiece, what will be the distance between the objective and the eyepiece ?

An object is placed in fron of a concave mirror of focal length 20cm. The image formed is three times the size of the object. Calculate the two possible distances of the object from the mirror.

A concave mirror forms an erect and there times magnified image on the axis of the mirror at a distance of 32 cm from the object. What is the focal length of the mirror?

An object is placed 30 cm away from a convex lens of focal length 10 cm and a sharp image is formed on a screen. Now a concave lens is placed in contact with the convex lens. The screen now has to be moved by 45 cm to get a sharp image again. The magnitude of focal length of the concare lens is (in cm)

An object is kept in front of a concave mirror of focal length 15 cm. The image formed is three times the size of the object. Calculate two possible distances of the object from the mirror.

WB JEE PREVIOUS YEAR PAPER-QUESTION PAPER 2011-PHYSICS
  1. Which type of Gate the following truth table represents ?

    Text Solution

    |

  2. A material has Poisson 's ratio 0.50 . If a uniform rod it suffers a l...

    Text Solution

    |

  3. Two identical springs are connected to mass m as shown (k= spring con...

    Text Solution

    |

  4. An object weighs m1 in a liquid of density d1 and that in liquid of ...

    Text Solution

    |

  5. A body floats in water with 40% of its volume outside water. When the ...

    Text Solution

    |

  6. Two soap bubbles of radii x and y coalesce to constitute a bubble of r...

    Text Solution

    |

  7. A particle of mass m is located in a one dimensional potential field w...

    Text Solution

    |

  8. In Young's double Slit experiment the two slits are d distances apar...

    Text Solution

    |

  9. A plane progressive wave is given by y = 2 cos 6.284 (330 t-x) . ...

    Text Solution

    |

  10. The displacement of a particle in S.H.M. varies according to the relat...

    Text Solution

    |

  11. Two temperature scale A and B are related by (A- 42)/( 110 ) =(B-72)...

    Text Solution

    |

  12. An ideal gas is compressed isothermally unit its pressure is doubled...

    Text Solution

    |

  13. Air inside a closed container is saturated with water vapour . The ai...

    Text Solution

    |

  14. 1.56 xx 10 ^(5) J of heat is conducted through a 2 m^(2) wall of ...

    Text Solution

    |

  15. A diver , at a depth of 12m in water ( mu = (4)/(3)) sees the sky ...

    Text Solution

    |

  16. Two thin lenses of focal lengths 20 cm and 25 cm are placed in contact...

    Text Solution

    |

  17. A convex lens of focal lengths 30 cm produces 5 times magnified real ...

    Text Solution

    |

  18. If the focal length of the eye piece of a telescope is doubled, its ma...

    Text Solution

    |

  19. A plano -concave lens is made of glass of refractive index 1.5 and rad...

    Text Solution

    |

  20. Four charges equal to -Q are placed at the four corners of a square an...

    Text Solution

    |