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What are coherent sources of light ? Why...

What are coherent sources of light ? Why are coherent sources required to obtain sustained interference pattern ?

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Because coherent sources are the sources emitting light waves having same frequecy , same wavelength and having zero or a constant phase difference.
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MODERN PUBLICATION-WAVE OPTICAL-Revision Exercises (Very Short Answer Questions)
  1. What are coherent sources?

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  2. State two conditions to obtain sustained interference of light. In you...

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  3. What are coherent sources of light ? Why are coherent sources required...

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  4. What is diffraction of light?

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  5. The refractive index of plastic is sqrt(3). Calculate the angle of ref...

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  6. State Huygens' principle of diffraction of light.

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  7. What happens to interference fringes when the distance between the two...

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  8. If one of the slits in Young's experiment is covered, what effect will...

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  9. Write the relationship between the path difference and the wavelength ...

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  10. What is the condition of obtaining bright interference fringes?

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  11. If you move the source slit closer to the double slit in Young's exper...

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  12. Will there be an interference pattern on the screen if the slits in Yo...

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  13. Distinguish between interference and diffraction of light.

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  14. Three lights of red, blue and green colour are used successively in Yo...

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  15. What wil be the effect on the fringes, if Young's double slit experime...

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  16. What will be the ratio of slit widths if the amplitudes of the light w...

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  17. What is the effect on the interference fringes in Young's double slit ...

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  18. What are coherent sources ? Define interfernece of light. Obtain the c...

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  19. What are coherent sources of light ? Why nointerference pattern is ob...

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  20. State the postulates of Huygens' wave theory.

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