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Q. Distinguish between interference and diffraction fringes?
Interference
Diffraction
1) It is because of the superposition of secondary wavelets from two different wave fronts produced by two coherent sources.
1) It is because of the superposition of secondary wavelets emitted from various points of the a. same wave front.
2) Fringes are evenly spaced.
2) Fringes are unevenly spaced.
3) Bright fringes are of similar intensity
3) Intensity falls rapidly
4) Comparing among diffraction it has large number of fringes
4) It has less number of fringes.
susceptibility by quink''s method
state and explain malus law?
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