Home
Class 12
PHYSICS
A biconvex lens of focal length f forms ...

A biconvex lens of focal length f forms a circular image of radius r of sun in focal plane . Then which option is correct

A

`pir^2 propf`

B

`pir^2 propf^2`

C

If lower half part is covered by black sheet, then area of the image is equal to `(pir^2)/2`

D

If f is doubled , intensity will increase

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • NTA NEET SET 73

    NTA MOCK TESTS|Exercise PHYSICS|45 Videos

  • NTA NEET SET 75

    NTA MOCK TESTS|Exercise PHYSICS|45 Videos

Similar Questions

Explore conceptually related problems

Rays of light from Sun falls on a biconvex lens of focal length f and the circular image of Sun of radius r is formed on the focal plane of the lens. Then

A convex lens of focal length f produces a virtual image n times the size of the object. Then the distance of the object from the lens is

A convex lens of focal length f will form a magnified real image of an object if the object is placed

A convex lens of focal length f forms an image which is 13/ times the size of the object. Then, the distance of object from the lends is

A concave lens of focal length f forms an image which is n times the size of the object What is the distance of the object from the lens in terms of f and n?

NTA MOCK TESTS-NTA NEET SET 74-PHYSICS
  1. A 0.2 mL sample of a solution containing 1.0xx10^(-7) curie of .(1)^(3...

    Text Solution

    |

  2. Two springs with negligible masses and force constants k1=200(N)/(m) a...

    Text Solution

    |

  3. Consider the given system of mass m and spring constant k. Find the ma...

    Text Solution

    |

  4. Light of two different frequencies whose photons have energies 1eV and...

    Text Solution

    |

  5. The de-Broglie wavelength of neutron in thermal equilibrium at tempera...

    Text Solution

    |

  6. A raindrop of radius 0.3 mm has a terminal velocity in air 1ms^(-1) . ...

    Text Solution

    |

  7. Two metal wires P and Q of same length and material are stretched by s...

    Text Solution

    |

  8. The distance between an object and the screen is 100cm. A lens produce...

    Text Solution

    |

  9. A biconvex lens of focal length f forms a circular image of radius r o...

    Text Solution

    |

  10. A rigid body is made of three identical thin rods, each of length L, f...

    Text Solution

    |

  11. A ring of mass M is kept on w horizontal rough surface . A force F is ...

    Text Solution

    |

  12. A p-n junction in series with a resistance of 5 kOmega is connected ac...

    Text Solution

    |

  13. Given the following truth table where A , B are inputs and Y the outp...

    Text Solution

    |

  14. A steel wire , of uniform area 2m^2 , is heated up to 50^@C and is st...

    Text Solution

    |

  15. Select the dimensional formula of B^2/(2mu0)

    Text Solution

    |

  16. If theta is the polarising angle for two optical media whose critical...

    Text Solution

    |

  17. At the first minimum adjacent to the central maximum of a single-slit ...

    Text Solution

    |

  18. An object of specific gravity rho is hung from a thin steel wire. The ...

    Text Solution

    |

  19. Two sound waves of wavelength 1 m and 1.01 m in a gas produce 10 beats...

    Text Solution

    |

  20. A uniform chain of length 2 m is kept on a table such that a length of...

    Text Solution

    |