Home
Class 12
PHYSICS
A boy is trying to start a fire by focus...

A boy is trying to start a fire by focussing sunlight on a piece of paper using an equiconvex lens of focal length 10 cm.The diamerter of the sun is `1.39 xx 10^9`m and its mean distance form the earth is `1.5 xx 10^(11)`.What is the diameter of the sun's image on the paper?

A

`6.5 xx 10^(-5)m`

B

`6.5 xx 10^(-4)m`

C

`9.3 xx 10^(-4)m`

D

`12.4 xx 10^(-4)m`.

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • UNIT TEST -06

    MODERN PUBLICATION|Exercise EXERCISE|461 Videos

  • TEXUAL QUESTIONS

    MODERN PUBLICATION|Exercise EXERCISE|195 Videos

  • UNIT TEST -07

    MODERN PUBLICATION|Exercise EXERCISE|154 Videos

Similar Questions

Explore conceptually related problems

An object is at a distance of 5 m from a convex mirror of focal length 10 cm.Where is he image formed ?

the gravitational force between sun and jupiter is approximately 4xx10^23 N. If mass of sum =1.99 xx 10^30 kg, the mean distance of the jupiter from the sun is 7.8 xx 10^11 m, find the mass of jupiter.

A refracting telescope has an objective of focal length 1 m and an eye-piece of focal length 20 cm. A real image of the sun 10 cm in diameter is formed on a screen 24 cm from the eye-piece. What angle does the sun subtend at the objective?

A saturn year is 29.5 times the earth year. How far is the saturn from the sun if the earth is 1.50 xx 10^8 km away from the sun ?

A negligible small current is passed through a wire of length 15 m and uniform cross section 6.0 xx 10^-7 m^2 and its resistance is measured to be 5.0 Omega . What is the resistivity of the material?

Calculate the force of gravitation between the earth and the sun, given the mass of earth = 6xx 10^24 kg and of the sun = 2 xx10^30 kg . Average distance between the two is 1.5xx 10^10m .

A card sheet divided into squares each of size 1 mm^2 is being viewed at a distance of 9 cm through a magnifying glass (a converging lens focal length 10 cm) held close to the eye. What is the magnification produced by the lens? How much is the area of each square in the virtual image?

A figure divided into squaes each of size 1 mm^2 is being viewed at a distance of 9 cm through magnifying lens of focal lengh 10 cm, held close to the eye. Draw the ray diagram showing the formation for the image.

MODERN PUBLICATION-UNIT TEST -06-EXERCISE
  1. A convex lens is dipped in a liquid,whose refrctive index is equal to ...

    Text Solution

    |

  2. A lens is placed between a souce of light and a wall.It forms images o...

    Text Solution

    |

  3. A boy is trying to start a fire by focussing sunlight on a piece of pa...

    Text Solution

    |

  4. A bulb is located on a wll.Its image of equal size is to be obtained o...

    Text Solution

    |

  5. A luminous object is placed at a distance of 30 cm from the convex len...

    Text Solution

    |

  6. A lens having focal length f and aperture of diameter d//2 in the cent...

    Text Solution

    |

  7. A plano-convex lens is made of a material of refrative index mu=1.5.Th...

    Text Solution

    |

  8. The radius of curvatrure of a thin plano-convex lens is 10 cm (of cur...

    Text Solution

    |

  9. A convex lens is dipped in a liquid,whose refrctive index is equal to ...

    Text Solution

    |

  10. If a convex lens of focal length 80 cm and a concave lens of focal len...

    Text Solution

    |

  11. A convex lens and a concave lens ,each having same focal length of 25 ...

    Text Solution

    |

  12. Two thin lenses of focal length f1 and f2 are in contact and coaxial.T...

    Text Solution

    |

  13. A beam of light composed of red and greeen ray is incident obliquely a...

    Text Solution

    |

  14. A ray light is incident on a 60^@ prism at the minimum deviation posit...

    Text Solution

    |

  15. The refracting angle of a prism is 60^@ nd the refractive index of the...

    Text Solution

    |

  16. A ray is incident at an angle of incidence i on one surface of a prism...

    Text Solution

    |

  17. The refractive index of the amterial of a prism is sqrt2 and its refra...

    Text Solution

    |

  18. The focal length of a coverging lens is measured for violet,green and ...

    Text Solution

    |

  19. If fv and fr are the focal lengths of a convex lens fro violet and red...

    Text Solution

    |

  20. Rainbow is formed due to combination fo

    Text Solution

    |