Answer:
With two narrow slits, an interference pattern is obtained. When one slit is completely covered, diffraction pattern is obtained. For intensity distribution curve for interference, see Fig.
For intensity distribution curve for diffraction, see Fig.
Interference
Diffraction
Fringes are of equal width
Fringes are of unequal width
Fringes are of equal intensity
Fringes are of decreasing intensity
Due to superposition of two different wave fronts
Due to superposition of secondary wavelets from different parts of the same wave front
Maxima occur at \[\theta =\frac{\lambda }{a}\]
Minima occur at \[\theta =\frac{\lambda }{a}\]
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