Condition for Observing Interference
Category : JEE Main & Advanced
(1) The initial phase difference between the interfering waves must remain constant. Otherwise the interference will not be sustained.
(2) The frequency and wavelengths of two waves should be equal. If not the phase difference will not remain constant and so the interference will not be sustained.
(3) The light must be monochromatic. This eliminates overlapping of patterns as each wavelength corresponds to one interference pattern.
(4) The amplitudes of the waves must be equal. This improves contrast with \[{{I}_{\max }}=4{{I}_{0}}\] and \[{{I}_{\min }}=0.\]
(5) The sources must be close to each other. Otherwise due to small fringe width \[\left( \beta \propto \frac{1}{d} \right)\] the eye can not resolve fringes resulting in uniform illumination.
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