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If a Monochromatic Source of Light is Replaced by White Light, What Change Would You Observe in the Diffraction Pattern? - Physics

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प्रश्न

If a monochromatic source of light is replaced by white light, what change would you observe in the diffraction pattern?

उत्तर

Following changes will be observed

(i) Central fringe will be bright but subsequent bright fringes will be coloured instead of just being bright.

(ii) Fringe width, angular fringe width will not be constant.

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Refraction of Monochromatic Light
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
2010-2011 (March) All India Set 3

संबंधित प्रश्‍न

When monochromatic light is incident on a surface separating two media, the reflected and refracted light both have the same frequency as the incident frequency.


'Two independent monochromatic sources of light cannot produce a sustained interference pattern'. Give reason.


Two monochromatic rays of light are incident normally on the face AB of an isosceles right-angled prism ABC. The refractive indices of the glass prism for the two rays '1' and '2' are respectively 1.3 and 1.5. Trace the path of these rays after entering the prism.


Two monochromatic rays of light are incident normally on the face AB of an isosceles right-angled prism ABC. The refractive indices of the glass prism for the two rays '1' and '2' are respectively 1.35 and 1.45. Trace the path of these rays after entering the prism.


Which of the following sources provides the best monochromatic light?


Can the interference pattern be produced by two independent monochromatic sources of light? Explain.


(a) Can the interference pattern be produced by two independent monochromatic sources of light? Explain.
(b) The intensity at the central maximum (O) in Young's double-slit experimental set-up shown in the figure is IO. If the distance OP equals one-third of the fringe width of the pattern, show that the intensity at point P, would `"I"_°/4`

(c) In Young's double-slit experiment, the slits are separated by 0⋅5 mm and the screen is placed 1⋅0 m away from the slit. It is found that the 5th bright fringe is at a distance of 4⋅13 mm from the 2nd dark fringe. Find the wavelength of light used.


Assertion(A): The photoelectrons produced by a monochromatic light beam incident on a metal surface have a spread in their kinetic energies.

Reason(R): The energy of electrons emitted from inside the metal surface, is lost in collision with the other atoms in the metal.


A narrow slit is illuminated by a parallel beam of monochromatic light of wavelength λ equal to 6000 Å and the angular width of the central maximum in the resulting diffraction pattern is measured. When the slit is next illuminated by light of wavelength λ’, the angular width decreases by 30%. Calculate the value of the wavelength λ’.


Monochromatic light of wavelength 600 nm is incident from the air on a water surface. The refractive index of water is 1.33. Find the

  1. wavelength,
  2. frequency and
  3. speed, of reflected and refracted light.

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