Home
Class 12
PHYSICS
A slit of width a is illuminated by whit...

A slit of width a is illuminated by white light. The first minimum for red light `(lambda=6500 Ã…)` will fall at `theta = 30^(@)` when a will be

A

`3250 Å`

B

`6.5xx10^(-4)mm`

C

`1.24` microns

D

`2.6xx10^(-4)cm`

Text Solution

Verified by Experts

The correct Answer is:
B
For first minima, `d sin theta=lambda/2 or d=lambda/(2sin theta)`
Promotional Banner

Topper's Solved these Questions

  • WAVE OPTICS

    DC PANDEY ENGLISH|Exercise taking it together|47 Videos

  • WAVE OPTICS

    DC PANDEY ENGLISH|Exercise Assertion reason|8 Videos

  • WAVE OPTICS

    DC PANDEY ENGLISH|Exercise For JEE Advanced E. Integer Type Questions|13 Videos

  • SOLVED PAPERS 2018

    DC PANDEY ENGLISH|Exercise JIPMER|22 Videos

Similar Questions

Explore conceptually related problems

A slit of width a is illuminiated by white light. The first diffraction minimum for light of lamda=6500 Å is formed at theta=30^(@) , then the width a of the slit is

A slit of width is illuminated by white light. For red light (lambda=6500Å) , the first minima is obtained at theta=30^@ . Then the value of will be

A slit of width a is illuminated by monochromatic light of wavelength 650 mm at normal incidence calculate the value of a when (a). The first minimum falls at an angle of diffraction of 30^(@) (b). The first maximum falls at an angle of diffraction of 30^(@) .

If red light is replaced by white light then width of diffraction pattern will

In the fraunhaufer differaction from a single slit illuminated by polychromatic light, the first minimum with wavelength lamda_(1) is found to be coincident with the third minimum at lamda_(2) . Then find the value of (lamda_(1))/(lamda_(2))

A slit of width d is illuminated by red light of wavelength 6500Å For what value of d will the first maximum fall at angle of diffractive of 30^(@)

A silt of width 'a' is illuminated by light of wavelength 6000 A^(@) FOR What value of 'a will the :- (i) First maximum fall at an angle of diffraction of 30^(@) ? (ii) First minimum fall at an angle of diffracton 30^(@) ?

In a Fraunhofer diffraction at single slit of width d with incident light of wavelength 5500 Ã…, the first minimum is observed, at angle 30^(@) . The first secondary maximum is observed at an angle theta=

A screen is at a distance of 2m from a narrow slit illuminated with light of 600nm. The first minimum lies 5mm on either side of the central maximum. The width of slit is

A screen is placed at 50cm from a single slit, which is illuminated with 600nm light. If separation between the first and third minima in the diffraction pattern is 3.0mm , then width of the slit is:

DC PANDEY ENGLISH-WAVE OPTICS-Check point
  1. Yellow light is used in a single slit diffraction experiment with slit...

    Text Solution

    |

  2. In Fresnel's class of diffraction the

    Text Solution

    |

  3. A slit of width a is illuminated by white light. The first minimum for...

    Text Solution

    |

  4. Light of wavelength 6328 Å is incident normally on a slit having a wid...

    Text Solution

    |

  5. A diffraction pattern is obtained using a beam of red light. What happ...

    Text Solution

    |

  6. Direction of the first secondary maximum in the Fraunhofer diffraction...

    Text Solution

    |

  7. A light wave is incident normally over a slit of width 24xx10^-5cm. Th...

    Text Solution

    |

  8. The first diffraction minima due to a single slit diffraction is at th...

    Text Solution

    |

  9. Light of wavelength 6328 Å is incident normally on a slit of width 0.2...

    Text Solution

    |

  10. Write two points of difference between interference and diffraction pa...

    Text Solution

    |

  11. The X-ray cannot be diffracted by means of an ordinary grating due to

    Text Solution

    |

  12. A polariser in used to

    Text Solution

    |

  13. Which of the following cannot be polarised?

    Text Solution

    |

  14. Light waves can be polarised as they are

    Text Solution

    |

  15. The transverse nature of light is shown by

    Text Solution

    |

  16. Through which character we can distiguish the light waves from sound w...

    Text Solution

    |

  17. Which of the following is incorrect?

    Text Solution

    |

  18. An optically active compound

    Text Solution

    |

  19. A polaroid is placed at 45^(@) to an incoming light of intensity I(0) ...

    Text Solution

    |

  20. When the angle of incidence on a material is 60^(@), the reflected lig...

    Text Solution

    |