Home
Class 11
PHYSICS
Assertion : In optical fibre, the diamet...

Assertion `:` In optical fibre, the diameter of the core is kept small.
Reason `:` This smaller diameter of the core ensures that the fibre should have incident angle more than the critical angle required for total internal reflection.

A

Statetment-I is True, Statement-II is True , Statement-II is a correct explanation for Statement-I

B

Statement-I is True, Statement-II is True , Statement-II is NOT a correct explanation for Statement-I

C

Statement-I is True, Statement-II is False

D

Statement-I is False, Statement-II is True

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • SEMICONDUCTORS

    ALLEN|Exercise Part-3(Exercise-4)|51 Videos
  • SEMICONDUCTORS

    ALLEN|Exercise Part-3(Exercise-2)|49 Videos
  • PHYSICAL WORLD, UNITS AND DIMENSIONS & ERRORS IN MEASUREMENT

    ALLEN|Exercise EXERCISE-IV|8 Videos
  • WAVES AND OSCILLATIONS

    ALLEN|Exercise Part-1(Exercise-05)[B]|42 Videos

Similar Questions

Explore conceptually related problems

Assertion : In optical fibre, the diameter of the core is kept small. Reason : The small diameter of the core ensures that the fibre should have inside it an angle greater than critical angle needed for total internal reflection.

Assertion: in optical fibre, the diameter of the core is kept small. Reason: This smaller diameter fo the fibre should have incident angle more than the critical angle required for total internal reflection.

Sparking Brilliance of Diamond: The total internal reflection of the light is used in polishing diamonds to create a sparking brilliance. By polishing the diamond with specific cuts, it is adjusted the most of the light rays approaching the surface are incident with an angle of incidence more than critical angle. Hence, they suffer multiple reflections and ultimately come out of diamond from the top. This gives the diamond a sparking brilliance. A diamond is immersed in a liquid with a refractive index greater than water. Then the critical angle for total internal reflection will

Assertion (A): In case of rainbow, light at the inner surface of the water drop gets internally reflected. Reason (R): The angle between the refracted ray and normal to the drop surface is greater than the critical angle.

Assertion (A) : In case of rainbow, light at the inner surface of the water drop gets internally reflected Reason (R): The angle between the refracted ray and normal to the drop surface is greater than the critical angle.

An optical fibre is made of glass fibre of refractive index 1.68. The outer coating of the glass fibre is made of material of refractive index 1.44. What is the range of angles of the incident rays with the axis of the pipe for which total internal reflection inside the optical fibre takes place?

The refractive index of the core of an optical fibre is mu_(2) and that of the cladding is mu_(1) .The angle of incidence on the face of the core so that the light ray just under goes total internal reflection at the cladding is

For an optical fibre ,the ratio of the refractive index of the core to the refractive index of the cladding is 1.25 . What is the critical angle at the core cladding interface ?

Assertion : Optical fibers are used for telecommunication. Reason : Optical fibres are based on the phenomenon of total internal reflection.

ALLEN-SEMICONDUCTORS-Part-3(Exercise-3)
  1. Assertion: The television broadcasting becomes weaker with increasing ...

    Text Solution

    |

  2. Assertion: The Microwave propagation is better than the sky wave propa...

    Text Solution

    |

  3. Statement-I : Semiconductors do not obey Ohm's law Statement-II : El...

    Text Solution

    |

  4. Statement-I : Germanium is preferred over silicon for making semicondu...

    Text Solution

    |

  5. Assertion : p-n junction diode can be used even at ultra high frequenc...

    Text Solution

    |

  6. Statement-I : A p-n junction with reverse bias can be used as a photod...

    Text Solution

    |

  7. Assertion: NAND or NOR gates are called digital building blocks. Rea...

    Text Solution

    |

  8. Assertion: Two P-N junction diodes placed back to back, will work as a...

    Text Solution

    |

  9. Statement-I : When base region has larger width, the collector current...

    Text Solution

    |

  10. Statement-I : For faster action, n-p-n transistor is used Statement-...

    Text Solution

    |

  11. Statement-I : To be used as amplifier, the transistor in the common em...

    Text Solution

    |

  12. Statement-I : Many channels get allowed when transmission frequency is...

    Text Solution

    |

  13. Statement-I : Optical fibres are free from electromagnetic disturbance...

    Text Solution

    |

  14. Statement-I : Diode lasers are used as optical sources in optical comm...

    Text Solution

    |

  15. Statement-I : Electromagnetic waves with frequencies smaller than the ...

    Text Solution

    |

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

    Text Solution

    |

  17. Statement-I : For the same antenna length, power radiated by short wav...

    Text Solution

    |

  18. Statemet-1: the electrical conductivity of earth's atmosphere increase...

    Text Solution

    |

  19. Assertion:- Optical communication system is more economical than other...

    Text Solution

    |

  20. Statement-I : A communication satellite is essentially a repeater in s...

    Text Solution

    |