Home
Class 11
PHYSICS
We cannot find rough focal length of...

We cannot find rough focal length of

A

convex mirror only

B

cncave mirror only

C

both convex and concave mirror

D

none of the above

Text Solution

Verified by Experts

The correct Answer is:
A

We cannot find rough focal length of a convex mirror because image formed in a convex mirror is always virtual and it cannot be taken on a screen.
Promotional Banner

Topper's Solved these Questions

  • RAY OPTICS

    PRADEEP|Exercise (Test Your Grip)Multiple Choice(a)|9 Videos
  • RAY OPTICS

    PRADEEP|Exercise (Test Your Grip)Multiple Choice(sec -A)|1 Videos
  • RAY OPTICS

    PRADEEP|Exercise Integer Question|4 Videos
  • PROPERTIES OF BULK MATTER

    PRADEEP|Exercise Multiple choice questions|7 Videos
  • SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

    PRADEEP|Exercise Assertion- Reason Type questions|20 Videos

Similar Questions

Explore conceptually related problems

Can we find rough focal length of a convex mirror ? If yes, how? If no, why not?

(a) Can you measure rough focal length of a convex lens? If yes, why? (b) Can you measure rough focal length of a concave lens ? If not, why not?

Rahul find the rough focal length of a convex lens. He is trying same method to find the focal length of concave lens, will he be successful. Justify your answer with help of ray diagram.

Two convex lenses of focal lengths 25 cm and 15 cm are placed in contact with each other. Find the focal length of combination.

A concave lens of focal length 12 cm and a convex lens of focal length 20 cm are kept in contact with each other . Find the focal length of the combination .

A convex lens of focal length f cut into parts first horizontally and then vertically. Find the focal length of part A of the lens, as shown:

The focal length of the objective of an astronomical telescope is 1.0 m. If the magnifying power of the telescope is 20, find the focal length of the eyepiece and the length of the telescope for the relaxed eye.

A concave lens of focal length 12 cm and a convex lens of focal length 20 cm are kept in contact with wach other. (i) Find the focal length of the combination. (ii) What will be the behaviour fo the combination ?

PRADEEP-RAY OPTICS-Assertion-Reason Question
  1. Assertion : The clouds in the sky generally appear to be whitish. Re...

    Text Solution

    |

  2. Assertion : In optical fibre, the diameter of the core is kept small. ...

    Text Solution

    |

  3. Assertion : A ray of light entering from glass to air suffers change i...

    Text Solution

    |

  4. Assertion : The frequencies of incident, reflected and refracted beam ...

    Text Solution

    |

  5. Statement-1 : A single lens produces a coloured image of an object ill...

    Text Solution

    |

  6. Statement-1 : it is impossible to photograph a virtual image. Statem...

    Text Solution

    |

  7. Statement-1 : If a convex lens is kept in water, its convergent power ...

    Text Solution

    |

  8. Statement-1 : A dentist uses a concave mirror to examine a small cavit...

    Text Solution

    |

  9. Statement-1 : The refractive index of a prism depends only on the kind...

    Text Solution

    |

  10. Statement-1 : Light travels faster in glass than in air. Statement-2...

    Text Solution

    |

  11. Statement-1 : When a prism of mu = 3//2 is immersed in water (mu = 4//...

    Text Solution

    |

  12. An experment is performed to find the refractive index of glass using ...

    Text Solution

    |

  13. A student measures the focal length of a convex lens by putting an obj...

    Text Solution

    |

  14. We cannot find rough focal length of

    Text Solution

    |

  15. The lens formula is

    Text Solution

    |

  16. The shape of graph between 1//u and 1//v in case of a convex lens is F...

    Text Solution

    |

  17. An equilaterial prism produces a minimum deviation of 30^@. The angle ...

    Text Solution

    |