Home
Class 12
PHYSICS
A 20 D lens is used as a magnifier. Wher...

A 20 D lens is used as a magnifier. Where should the object be placed to obtain maximum angular magnification? (Given, D=25 cm).

Text Solution

Verified by Experts

Focal length of the lens,
`f=1/20m=100/20cm=5 cm`
Maximum angular magnification is obtained when final image is formed at D. Hence,
`1/(-25)-1/(-u_(0))=1/5rArru_(0)=4.17 cm`
Promotional Banner

Topper's Solved these Questions

  • RAY OPTICS

    DC PANDEY|Exercise Checkpoint 9.1|10 Videos

  • RAY OPTICS

    DC PANDEY|Exercise Checkpoint 9.2|10 Videos

  • NUCLEI

    DC PANDEY|Exercise C MADICAL ENTRANCES GALLERY|46 Videos

  • REFLECTION OF LIGHT

    DC PANDEY|Exercise Subjective|9 Videos

Similar Questions

Explore conceptually related problems

(a) An object is seen through a simple microscope of focal length 12cm . Find the angular magnification produced if the image is formed at the near point of the eye which is 25cm away from it. (b) A 10D lens is used as a magnifier. Where shold the object be placed to obtain maximum angular magnification for a nirmal eye (near point = 25cm) ?

A simple microscope of power 15 D is used to see an object. If the least distance of distinct vision is 25 cm, where should the object be placed so as to produce maximum angular magnification?

An object is to be seen through a simple microscope of power 10D. Where should the object be placed so as to produced maximum angular magnification ? The least distance for distinct vision is 25 cm.

An object is to be seen through a simple microscope of focal length 12 cm. Where should the object be placed so as to produce maximum angular magnification? The least distance for clear vision is 25 cm.

An object is to be seen through a simple microscope of power 10 D . Where should an object be placed to produce maximum angular magnification ? Least distance of distinct vision is 25 cm .

When an object is placed at a distance 60 cm from a convex spherical mirror, the magnification produced is 1//2 . Where should the object be placed to get a magnification of 1//3 ?

Where should an object be placed in order of to use a convex lens as a magnifying glass?

Two lenses of power +10 D and - 5 D are placed in contact. Where should an object be held from the lens, so as to obtain a virtual image of magnification 2 ?

DC PANDEY-RAY OPTICS-Medical entrance gallary
  1. A 20 D lens is used as a magnifier. Where should the object be placed ...

    Text Solution

    |

  2. Two identical glass (mu(g)=3//2) equi- convex lenses of focal length f...

    Text Solution

    |

  3. An air bubble in a glass slab with refractive index 1.5 (near normal i...

    Text Solution

    |

  4. A person can see clearly objects only when they lie between 50 cm and ...

    Text Solution

    |

  5. An astronomical telesope has objective and eyepiece of focal lengths 4...

    Text Solution

    |

  6. Match the corresponding entries of Column I with Column II.

    Text Solution

    |

  7. The angle of incidence for a ray of light at a refracting surface of a...

    Text Solution

    |

  8. Two identical thin planoconvex glass lenses (refractive index 1.5) eac...

    Text Solution

    |

  9. The refracting angle of a prism is A and refractive index of the mater...

    Text Solution

    |

  10. The near point and far point of a person are 40cm and 250cm, respectiv...

    Text Solution

    |

  11. An object is seen thorugh a simple microscope of focal length 12 c. Fi...

    Text Solution

    |

  12. Angle of minimum deviation for a prism of refractive index 1.5 is equa...

    Text Solution

    |

  13. A ray of light passes from a medium A having refractive index 1.6. to ...

    Text Solution

    |

  14. The focal length of a converting lens are f(v) and f(r) for violet and...

    Text Solution

    |

  15. Aperture of human eye is 0.2cm. The minimum magnifying power of a visa...

    Text Solution

    |

  16. An object is located 4cm from the first of two thin converging lenses ...

    Text Solution

    |

  17. If mu(v)=1.530 and mu(R)=1.5145, then disperisve power of a crown glas...

    Text Solution

    |

  18. Disperion of light is caused due to

    Text Solution

    |

  19. Calculate the focal length of a reading glass of a person, if the dist...

    Text Solution

    |

  20. A person wants a real image of his own, 3 times enlarged. Where should...

    Text Solution

    |

  21. The magnification power of a convex lens of focal length 10cm, when th...

    Text Solution

    |