Home
Class 10
PHYSICS
Lens X has focal length 20 cm and lens Y...

Lens X has focal length 20 cm and lens Y has focal length 40 cm. Which lens would you select to obtain a more convergent beam of light ?

Text Solution

Verified by Experts

Smaller the focal length of a lens large is its converging power. Lens X would produce a more convergent beam as its focal length is only 20 cm.
Promotional Banner

Topper's Solved these Questions

  • LIGHT - REFLECTION AND REFRACTION

    ZEN PUBLICATION|Exercise ZEN ADDITIONAL QUESTIONS SECTION (SHORT ANSWER [SA] TYPE - I QUESTIONS)|28 Videos

  • LIGHT - REFLECTION AND REFRACTION

    ZEN PUBLICATION|Exercise ZEN ADDITIONAL QUESTIONS SECTION (SHORT ANSWER [SA] TYPE - II QUESTIONS)|34 Videos

  • LIGHT - REFLECTION AND REFRACTION

    ZEN PUBLICATION|Exercise ZEN ADDITIONAL QUESTIONS SECTION (MULTIPLE - CHOICE QUESTIONS)|70 Videos

  • ELECTRICITY

    ZEN PUBLICATION|Exercise ZEN ADDITIONAL QUESTIONS SECTION (MULTIPLE CHOICE QUESTIONS)|60 Videos

  • MAGNETIC EFFECTS OF ELECTRIC CURRENT

    ZEN PUBLICATION|Exercise Additional question section (Higher-order thinking skills [HOTS] questions)|20 Videos

Similar Questions

Explore conceptually related problems

The power of a concave lens of focal length 50 cm is :

A convex lens A of focal length 20 cm and a concave lens B of focal length 5 cm are kept along the same axis with a distance d between them. What is the value of d if a parallel beam of light incident on A leaves B as a parallel beam ?

The focal length of lens does not depend on :

A focal length of a lens is 10 cm. What is power of a lens in dioptre?

The focal length of convex lens is 50 cm, its power is

What is the focal length of a convex lens of focal length 30cm in contact with a concave lens of focal length 20cm? Is the system a converging or a diverging lens? Ignore thickness of the lenses.

A convex lens of focal length 10 cm is placed in contact with a concave lens of focal length 20 cm. What is the nature and focal length of the combination ?

ZEN PUBLICATION-LIGHT - REFLECTION AND REFRACTION-ZEN ADDITIONAL QUESTIONS SECTION (VERY SHORT ANSWER TYPE QUESTIONS) VSA
  1. A light ray travelling from medium 1 to medium 2, does not suffer refr...

    Text Solution

    |

  2. What do you understand from the term 'Refractive index' of a medium or...

    Text Solution

    |

  3. Lens X has focal length 20 cm and lens Y has focal length 40 cm. Which...

    Text Solution

    |

  4. Concave mirrors A and B each focal length - 15 cm. Concave mirror A ha...

    Text Solution

    |

  5. A convex lens has a focal length 15 cm. A student obtains a clear shar...

    Text Solution

    |

  6. Can we find the focal length of a concave lens using the distant objec...

    Text Solution

    |

  7. A concave mirror is dipped in vessel containing kerosene. Will this af...

    Text Solution

    |

  8. What is the kind of mirror used by an ENT specialist to examine the ea...

    Text Solution

    |

  9. A convex lens is immersed in a container of water. Will this cause a c...

    Text Solution

    |

  10. When a light ray emerges out after refraction at a rectangular glass s...

    Text Solution

    |

  11. Define the following terms in the context of spherical mirrors : (...

    Text Solution

    |

  12. What is the minimum distance between an object and its real image in t...

    Text Solution

    |

  13. Why does ray of light passing through the centre of curvature of a con...

    Text Solution

    |

  14. When a light ray is incident normally on a mirror. What is its angle o...

    Text Solution

    |

  15. What is the relation between focal length of a spherical mirror and it...

    Text Solution

    |

  16. Express the relation between the power (P) and the focal length of a l...

    Text Solution

    |

  17. List the important factor on which the ability of a lens to converge o...

    Text Solution

    |

  18. A light ray travelling from medium 1 to medium 2, does not suffer refr...

    Text Solution

    |

  19. What do you understand from the term 'Refractive index' of a medium or...

    Text Solution

    |

  20. Lens X has focal length 20 cm and lens Y has focal length 40 cm. Which...

    Text Solution

    |