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Why do not two light sources of the same...

Why do not two light sources of the same type produce interference pattern?

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Primary condition for the formation of interference fringes is that the two surces must be coherent and the phases difference between the intended waves for interference pattern on superposition must remain constant.
Extended light sources are aggregation of point sources where temperature varies from point to point which affects the radiation. Due to random vibration of particles emitting light there is continuous change in phase. Thus no two point sources from an extended source maintain a constant phase difference hence are not coherent sources only. Therefore a general illumination is found all over the screen rather than any interence fringes.
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CHHAYA PUBLICATION-LIGHT WAVE AND INTERFERENCE OF LIGHT -HIGHER ORDER THINKING SKILL (HOTS) QUESTIONS
  1. Interference fringe does not contradict the law of conservation of ene...

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  2. Two media of refractive indices mu(1) and mu(2)(nu(1) gt mu (2)) are s...

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  3. Why do not two light sources of the same type produce interference pat...

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  4. what are non -localised fringes?

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  5. Explain the change thet occurs in the interference pat tern in an Youn...

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  6. If all experiments related to young's double slit inter ference is per...

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  7. Two waves whose intensities are in the ratio 9:1 interfere.find the r...

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  8. In a Young's double slit experiment one of the slits is covered (i) wi...

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  9. What is the effect on the interence pattern in Young's double slit exp...

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  10. In Young's double slit experiment if distance between the two slits is...

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  11. In Young's double slit experiment what is the path difference between ...

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  12. What is the significance of optical path?

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  13. Two light beams of intersities I and 4I, respectively form interferenc...

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  14. Ratio of the amplitudes of two waves emitted from a pair of coherent ...

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  15. If ratio pf maximum to minimum intensities of the fringes, produced in...

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  16. Light waves of different intensities from two coherent sources superp...

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  17. In a laboratory, interference fringes are observed in air medium. The ...

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  18. What change will be observed in the interference pattern produced in Y...

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  19. In a double slit experiment using a white light, a white fringe is not...

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  20. Why did Huygens introduce the concept of secondary wavelets?

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