Home
Class 12
PHYSICS
A lens haivng focal length and aperture ...

A lens haivng focal length and aperture of diameter d forms an image of intensity `I`. Aperture of diameter `d/2` in central region of lens is covered by a black paper. Focal length of lens and intensity of image now will be respectively.

A

`f and I/4`

B

`(3f)/(4) and I/2`

C

`f and (3I)/(4)`

D

`f/2 and I/2`

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • QUESTION-PAPERS-2015

    BITSAT GUIDE|Exercise PHYSICS |40 Videos

  • QUESTION-PAPERS-2017

    BITSAT GUIDE|Exercise PHYSICS |40 Videos

Similar Questions

Explore conceptually related problems

A thin lens focal length f_(1) and its aperture has diameter d . It forms an image of intensity I . Now the central part of the aperture up to diameter (d)/(2) is blocked by an opaque paper. The focal length and image intensity will change to

A thin convex lens of focal length f, has its aperture of diameter d. It forms a real iomage of intensity I. The central part of the aperture is blocked by an opaque paper of diameter (d)/(2) . What is the focal length of the lens and the intensity of image formed by the lens ?

Power of a lens is + 3 D. What will be the focal length of the lens?

The focal length of a lens of power + 4D is :

A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since:

A laser beam of 10mW power and wavelength 700nm has aperture of 3mm . If it is focused by a lens of focal length 5cm , the intensity of image is

BITSAT GUIDE-QUESTION-PAPERS-2016-PHYSICS
  1. A parallel plate capacitor of area ‘A’ plate separation ‘d’ is filled ...

    Text Solution

    |

  2. In the Young's double-slit experiment,the intensity of light at a poin...

    Text Solution

    |

  3. The mass of ""(7)N^(15) is 15.00011 amu, mass of ""(8)O^(16) is 15.994...

    Text Solution

    |

  4. A wire carrying current I has the shape as shown in the adjoining ...

    Text Solution

    |

  5. A stone projected with a velocity u at an angle (theta )with the horiz...

    Text Solution

    |

  6. If the series limit wavelength of the Lyman series for hydrogen atom i...

    Text Solution

    |

  7. In the shown arrangement of the experiment of the meter bridge if AC c...

    Text Solution

    |

  8. A 1 kg mass is attached to a spring of force constant 600 N/m and rest...

    Text Solution

    |

  9. The frequency of vibration of string is given by v=p/(2l)[F/m]^(1//2)....

    Text Solution

    |

  10. For the angle of minimum deviation of a prism to be equal to its refr...

    Text Solution

    |

  11. Consider elastic collision of a particle of mass m moving with a veloc...

    Text Solution

    |

  12. A conducting circular loop is placed in a uniform magnetic field 0.04T...

    Text Solution

    |

  13. Figure below shows two paths that may be taken by a gas to go from a s...

    Text Solution

    |

  14. Two equal resistance at 0^(@)C with temperature coefficient of resista...

    Text Solution

    |

  15. Two identical charged spheres suspended from a common point by two mas...

    Text Solution

    |

  16. A point particle of mass 0.1kg is executing SHM of amplitude 0.1m. Whe...

    Text Solution

    |

  17. A source of sound S emitting waves of frequency 100 Hz and an observer...

    Text Solution

    |

  18. A resistor of resistance R, capacitor of capacitance C and inductor of...

    Text Solution

    |

  19. A lens haivng focal length and aperture of diameter d forms an image o...

    Text Solution

    |

  20. A circular disc of radius R and thickness R//6 has moment of inertia I...

    Text Solution

    |