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What are coherent sources of light ? Why...

What are coherent sources of light ? Why nointerference pattern is observed when two coherent sources are (i) too close (ii) very far apart ?

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In this case, d will be very large and fringe width will be too small to be seen. Hence, no pattern will be obtained.
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MODERN PUBLICATION-WAVE OPTICAL-Revision Exercises (Very Short Answer Questions)
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  2. What are coherent sources ? Define interfernece of light. Obtain the c...

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

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  4. State the postulates of Huygens' wave theory.

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  5. What is the condition for diffraction to take place ?

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  6. Why diffraction is better experienced in sound waves than in light wav...

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  7. What will be the effect on the width of the central maxima if the slit...

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  8. Why light waves cannot show diffracton around hills and tall buildings...

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  9. How does the angular separation between frings in single-slit diffract...

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  10. State one defect of Huygens's wave theory.

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  11. In case of diffraction from a singel slit, if red light is replaced by...

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  12. What is the condition for the nth secondary minima in case of diffract...

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  16. The intensity of scattered light I in Ray leigh scattering is proporti...

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  17. What is the speed of light in a denser medium of polarising of polaris...

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  18. The resolving power of a microscope at 6000 Å is 10^(4). What is its r...

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  19. Deduce Snell's Law of refraction for a plane wave using Huygen's princ...

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  20. Why we use the objective lens of larger aperture to increase the resol...

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